Open, small-incision, or laparoscopic cholecystectomy for patients with symptomatic cholecystolithiasis. An overview of Cochrane Hepato-Biliary Group reviews
- PMID: 20091665
- PMCID: PMC7180153
- DOI: 10.1002/14651858.CD008318
Open, small-incision, or laparoscopic cholecystectomy for patients with symptomatic cholecystolithiasis. An overview of Cochrane Hepato-Biliary Group reviews
Abstract
Background: Patients with symptomatic cholecystolithiasis are treated by three different techniques of cholecystectomy: open, small-incision, or laparoscopic. There is no overview on Cochrane systematic reviews on these three interventions.
Objectives: To summarise Cochrane reviews that assess the effects of different techniques of cholecystectomy for patients with symptomatic cholecystolithiasis.
Methods: The Cochrane Database of Systematic Reviews (CDSR) was searched for all systematic reviews evaluating any interventions for the treatment of symptomatic cholecystolithiasis (Issue 4 2008).
Main results: Three systematic reviews that included a total of 56 randomised trials with 5246 patients are included in this overview of reviews. All three reviews used identical inclusion criteria for trials and participants, and identical methodological assessments.Laparoscopic versus small-incision cholecystectomy Thirteen trials with 2337 patients randomised studied this comparison. Bias risk was relatively low. There was no significant difference regarding mortality or complications. Total complications of laparoscopic and small-incision cholecystectomy were high, ie, 17.0% and 17.5%. Total complications (risk difference, random-effects model -0.01 (95% confidence interval (CI) -0.07 to 0.05)), hospital stay (mean difference (MD), random-effects -0.72 days (95% CI -1.48 to 0.04)), and convalescence were not significantly different. Trials with low risk of bias showed a quicker operative time for small-incision cholecystectomy (MD, low risk of bias considering 'blinding', random-effects model 16.4 minutes (95% CI 8.9 to 23.8)) while trials with high risk of bias showed no statistically significant difference.Laparoscopic versus open cholecystectomy Thirty-eight trials with 2338 patients randomised studied this comparison. Bias risk was high. Laparoscopic cholecystectomy patients had a shorter hospital stay (MD, random-effects model -3 days (95% CI -3.9 to -2.3)) and convalescence (MD, random-effects model -22.5 days (95% CI -36.9 to -8.1)) compared with open cholecystectomy but did not differ significantly regarding mortality, complications, and operative time.Small-incision versus open cholecystectomy Seven trials with 571 patients randomised studied this comparison. Bias risk was high. Small-incision cholecystectomy had a shorter hospital stay (MD, random-effects model -2.8 days (95% CI -4.9 to -0.6)) compared with open cholecystectomy but did not differ significantly regarding complications and operative time.
Authors' conclusions: No statistically significant differences in the outcome measures of mortality and complications have been found among open, small-incision, and laparoscopic cholecystectomy. There were no data on symptom relief. Complications in elective cholecystectomy are high. The quicker recovery of both laparoscopic and small-incision cholecystectomy patients compared with patients on open cholecystectomy justifies the existing preferences for both minimal invasive techniques over open cholecystectomy. Laparoscopic and small-incision cholecystectomies seem to be comparable, but the latter has a significantly shorter operative time, and seems to be less costly.
Conflict of interest statement
The authors of this overview also conducted all the three included systematic reviews. Additionally, the authors also conducted one of the trials with low risk of bias on laparoscopic versus small‐incision cholecystectomy.
Similar articles
-
Laparoscopic versus small-incision cholecystectomy for patients with symptomatic cholecystolithiasis.Cochrane Database Syst Rev. 2006 Oct 18;2006(4):CD006229. doi: 10.1002/14651858.CD006229. Cochrane Database Syst Rev. 2006. PMID: 17054284 Free PMC article.
-
Laparoscopic versus open cholecystectomy for patients with symptomatic cholecystolithiasis.Cochrane Database Syst Rev. 2006 Oct 18;(4):CD006231. doi: 10.1002/14651858.CD006231. Cochrane Database Syst Rev. 2006. PMID: 17054285
-
Small-incision versus open cholecystectomy for patients with symptomatic cholecystolithiasis.Cochrane Database Syst Rev. 2006 Oct 18;2006(4):CD004788. doi: 10.1002/14651858.CD004788.pub2. Cochrane Database Syst Rev. 2006. PMID: 17054215 Free PMC article.
-
Abdominal lift for laparoscopic cholecystectomy.Cochrane Database Syst Rev. 2012 May 16;(5):CD006574. doi: 10.1002/14651858.CD006574.pub3. Cochrane Database Syst Rev. 2012. Update in: Cochrane Database Syst Rev. 2013 Aug 31;(8):CD006574. doi: 10.1002/14651858.CD006574.pub4. PMID: 22592713 Updated.
-
Percutaneous cholecystostomy for high-risk surgical patients with acute calculous cholecystitis.Cochrane Database Syst Rev. 2013 Aug 12;(8):CD007088. doi: 10.1002/14651858.CD007088.pub2. Cochrane Database Syst Rev. 2013. PMID: 23939652
Cited by
-
Robot-assisted pancreatic surgery: a systematic review of the literature.HPB (Oxford). 2013 Jan;15(1):1-10. doi: 10.1111/j.1477-2574.2012.00589.x. Epub 2012 Oct 17. HPB (Oxford). 2013. PMID: 23216773 Free PMC article.
-
Laparoscopic or open cholecystectomy in cirrhosis: a systematic review of outcomes and meta-analysis of randomized trials.HPB (Oxford). 2012 Mar;14(3):153-61. doi: 10.1111/j.1477-2574.2011.00425.x. Epub 2012 Jan 18. HPB (Oxford). 2012. PMID: 22321033 Free PMC article.
-
Time trend and variability of open versus laparoscopic cholecystectomy in patients with symptomatic gallstone disease.Surg Endosc. 2013 Sep;27(9):3254-61. doi: 10.1007/s00464-013-2902-y. Epub 2013 Mar 22. Surg Endosc. 2013. PMID: 23519490
-
Acute cholecystitis in high risk surgical patients: percutaneous cholecystostomy versus laparoscopic cholecystectomy (CHOCOLATE trial): study protocol for a randomized controlled trial.Trials. 2012 Jan 12;13:7. doi: 10.1186/1745-6215-13-7. Trials. 2012. PMID: 22236534 Free PMC article. Clinical Trial.
-
Cholecystectomy in the very elderly--is 90 the new 70?J Gastrointest Surg. 2012 Feb;16(2):282-5. doi: 10.1007/s11605-011-1708-2. Epub 2011 Dec 6. J Gastrointest Surg. 2012. PMID: 22143419
References
References to included reviews
Keus 2006a
Keus 2006b
Additional references
Atkins 2004
Atkins 2005
Attili 1995
-
- Attili AF, Carulli N, Roda E, Barbara B, Capocaccia L, Menotti A, et al. Epidemiology of gallstone disease in Italy: prevalence data of the Multicenter Italian Study on Cholelithiasis (M.I.COL.). American Journal of Epidemiology 1995;141(2):158‐65. [PUBMED: 7817971] - PubMed
Barkun 1992
-
- Barkun JS, Barkun AN, Sampalis JS, Fried G, Taylor B, Wexler MJ, et al. Randomised controlled trial of laparoscopic versus mini cholecystectomy. The McGill Gallstone Treatment Group. Lancet 1992;340(8828):1116‐9. [PUBMED: 1359210] - PubMed
Barkun 1995
-
- Barkun JS, Caro JJ, Barkun AN, Trindade E. Cost‐effectiveness of laparoscopic and mini‐cholecystectomy in a prospective randomized trial. Surgical Endoscopy 1995;9(11):1221‐4. [PUBMED: 8553241] - PubMed
Bradburn 2007
-
- Bradburn MJ, Deeks JJ, Berlin JA, Russell Localio A. Much ado about nothing: a comparison of the performance of meta‐analytical methods with rare events. Statistics in Medicine 2007;26(1):53‐77. - PubMed
Brok 2008
-
- Brok J, Thorlund K, Gluud C, Wetterslev J. Trial sequential analysis reveals insufficient information size and potentially false positive results in many meta‐analyses. Journal of Clinical Epidemiology 2008;61(8):763‐9. [PUBMED: 18411040] - PubMed
Brok 2009
-
- Brok J, Thorlund K, Wetterslev J, Gluud C. Apparently conclusive meta‐analyses may be inconclusive ‐ Trial sequential analysis adjustment of random error risk due to repetitive testing of accumulating data in apparently conclusive neonatal meta‐analyses. International Journal of Epidemiology 2009;38(1):287‐98. [PUBMED: 18824466] - PubMed
Bruce 1999
-
- Bruce DM, Smith M, Walker CB, Heys SD, Binnie NR, Gough DB, et al. Minimal access surgery for cholelithiasis induces an attenuated acute phase response. American Journal of Surgery 1999;178(3):232‐4. [PUBMED: 10527445] - PubMed
Calvert 2000
-
- Calvert NW, Troy GP, Johnson AG. Laparoscopic cholecystectomy: a good buy? A cost comparison with small‐incision (mini) cholecystectomy. The European Journal of Surgery 2000;166(10):782‐6. [PUBMED: 11071165] - PubMed
Coelho 1993
-
- Coelho JC, Araujo RP, Marchesini JB, Coelho IC, Araujo LR. Pulmonary function after cholecystectomy performed through Kocher's incision, a mini‐incision, and laparoscopy. World Journal of Surgery 1993;17(4):544‐6. [PUBMED: 8362533] - PubMed
Deveney 1993
-
- Deveney KE. The early experience with laparoscopic cholecystectomy in Oregon. Archives of Surgery (Chicago, Ill.: 1960) 1993;128(6):627‐32. [PUBMED: 8503764] - PubMed
Deziel 1993
-
- Deziel DJ, Millikan KW, Economou SG, Doolas A, Ko ST, Airan MC. Complications of laparoscopic cholecystectomy: a national survey of 4,292 hospitals and an analysis of 77,604 cases. American Journal of Surgery 1993;165(1):9‐14. [PUBMED: 8418705] - PubMed
Deziel 1994
-
- Deziel DJ. Complications of cholecystectomy. Incidence, clinical manifestations, and diagnosis. The Surgical Clinics of North America 1994;74(4):809‐23. [PUBMED: 8047943] - PubMed
Downs 1996
Dubois 1982
-
- Dubois F, Berthelot B. Cholecystectomy through minimal incision (author's translation) [Cholecystectomie par mini‐laparotomie]. La Nouvelle Presse Medicale 1982;11(15):1139‐41. [PUBMED: 7079137] - PubMed
Dunker 1998
-
- Dunker MS, Stiggelbout AM, Hogezand RA, Ringers J, Griffioen G, Bemelman WA. Cosmesis and body image after laparoscopic‐assisted and open ileocolic resection for Crohn’s disease. Surgical Endoscopy 1998;12:1334‐40. - PubMed
Egger 2003
-
- Egger M, Davey SG, Schneider M, Binder C. Bias in meta‐analysis detected by a simple, graphical test. Health Technology Assessment 2003;7(1):1‐76. - PubMed
Everhart 1999
-
- Everhart JE, Khare M, Hill M, Maurer KR. Prevalence and ethnic differences in gallbladder disease in the United States. Gastroenterology 1999;117(3):632‐9. [PUBMED: 10464139] - PubMed
Gluud 2009
-
- Gluud C, Nikolova D, Klingenberg SL, Alexakis N, Als‐Nielsen B, Colli A, et al. Cochrane Hepato‐Biliary Group. About The Cochrane Collaboration (Cochrane Review Groups (CRGs)). 2009, Issue 4. Art. No.: LIVER.
Goco 1983
-
- Goco IR, Chambers LG. "Mini‐cholecystectomy" and operative cholangiography. A means of cost containment. The American Surgeon 1983;49(3):143‐5. [PUBMED: 6830067] - PubMed
Graves 2002
-
- Graves N, Walker D, Raine R, Hutchings A, Roberts JA. Cost data for individual patients included in clinical studies: no amount of statistical analysis can compensate for inadequate costing methods. Health Economics 2002;11(8):735‐9. [PUBMED: 12457373] - PubMed
Guyatt 2008
Guyatt 2008a
Harju 2006
-
- Harju J, Juvonen P, Eskelinen M, Miettinen P, Paakkonen M. Minilaparotomy cholecystectomy versus laparoscopic cholecystectomy: a randomized study with special reference to obesity. Surgical Endoscopy 2006;20(4):583‐6. [PUBMED: 16437283] - PubMed
Higgins 2006
-
- Higgins JPT, Green S (editors). Cochrane Handbook for Systematic Reviews of Interventions Version 4.2.6 [updated September 2006]. The Cochrane Collaboration, 2006. Available from www.cochrane‐handbook.org.
Higgins 2008
-
- Higgins JPT, Green S (editors). Cochrane Handbook for Systematic Reviews of Interventions Version 5.0.1 [updated September 2008]. The Cochrane Collaboration, 2008. Available from www.cochrane‐handbook.org.
Jensen 1991
-
- Jensen KH, Jorgensen T. Incidence of gallstones in a Danish population. Gastroenterology 1991;100(3):790‐4. [PUBMED: 1993501] - PubMed
Johnston 1993
-
- Johnston DE, Kaplan MM. Pathogenesis and treatment of gallstones. The New England Journal of Medicine 1993;328(6):412‐21. [PUBMED: 8421460] - PubMed
Jüni 2001
Keus 2007
-
- Keus F, Ahmed Ali U, Noordergraaf GJ, Roukema JA, Gooszen HG, Laarhoven CJ. Anaesthesiological considerations in small‐incision and laparoscopic cholecystectomy in symptomatic cholecystolithiasis: implications for pulmonary function. A randomized clinical trial. Acta Anaesthesiologica Scandinavica 2007;51(8):1068‐78. [PUBMED: 17697302] - PubMed
Keus 2008a
-
- Keus F, Gooszen HG, Laarhoven CJ. Systematic review: Cochrane Hepato‐Biliary Group systematic review of randomized clinical trials: open, small‐incision, or laparoscopic cholecystectomy for symptomatic cholecystolithiasis. Alimentary Pharmacology & Therapeutics 2009;29(4):359‐78. [PUBMED: 19035965] - PubMed
Keus 2008b
Keus 2008c
-
- Keus F, Werner JE, Gooszen HG, Oostvogel HJ, Laarhoven CJ. Randomized clinical trial of small‐incision and laparoscopic cholecystectomy in patients with symptomatic cholecystolithiasis: primary and clinical outcomes. Archives of Surgery (Chicago, Ill.: 1960) 2008;143(4):371‐7; discussion 377‐8. [PUBMED: 18427025] - PubMed
Keus 2009a
-
- Keus F, Wetterslev J, Gluud C, Gooszen HG, Laarhoven CJHM. Robustness assessments are needed to reduce bias in meta‐analyses including zero‐event randomized trials. American Journal of Gastroenterology 2009;104(3):546‐51. - PubMed
Keus 2009b
-
- Keus F, Wetterslev J, Gluud C, Gooszen HG, Laarhoven CJHM. Trial sequential analyses of meta‐analyses of complications in laparoscopic versus small‐incision cholecystectomy. Journal of Clinical Epidemiology 2009;in press:doi:10.1016/j.jclinepi.2009.08.023 . - PubMed
Keus 2009c
Kjaergard 2001
-
- Kjaergard LL, Villumsen J, Gluud C. Reported methodologic quality and discrepancies between large and small randomized trials in meta‐analyses. Annals of Internal Medicine 2001;135(11):982‐9. [PUBMED: 11730399] - PubMed
Korolija 2004
-
- Korolija D, Sauerland S, Wood‐Dauphinee S, Abbou CC, Eypasch E, Caballero MG, et al. Evaluation of quality of life after laparoscopic surgery: evidence‐based guidelines of the European Association for Endoscopic Surgery. Surgical Endoscopy 2004;18(6):879‐97. [PUBMED: 15108103] - PubMed
Kunz 1992
-
- Kunz R, Orth K, Vogel J, Steinacker JM, Meitinger A, Bruckner U, et al. Laparoscopic cholecystectomy versus mini‐lap‐cholecystectomy. Results of a prospective, randomized study [Laparoskopische Cholecystektomie versus Mini‐Lap‐Cholecystektomie. Ergebnisse einer prospektiven, randomisierten Studie.]. Der Chirurg; Zeitschrift fur alle Gebiete der operativen Medizen 1992;63(4):291‐5. [PUBMED: 1534528] - PubMed
Ledet 1990
-
- Ledet WP Jr. Ambulatory cholecystectomy without disability. Archives of Surgery (Chicago, Ill.: 1960) 1990;125(11):1434‐5. [PUBMED: 2241552] - PubMed
Legorreta 1993
-
- Legorreta AP, Silber JH, Costantino GN, Kobylinski RW, Zatz SL. Increased cholecystectomy rate after the introduction of laparoscopic cholecystectomy. Journal of the American Medical Association 1993;270(12):1429‐32. [PUBMED: 8371441] - PubMed
Litwin 1992
-
- Litwin DE, Girotti MJ, Poulin EC, Mamazza J, Nagy AG. Laparoscopic cholecystectomy: trans‐Canada experience with 2201 cases. Canadian Journal of Surgery. Journal Canadien de Chirurgie 1992;35(3):291‐6. [PUBMED: 1535548] - PubMed
McMahon 1993
-
- McMahon AJ, Baxter JN, Kenny G, O'Dwyer PJ. Ventilatory and blood gas changes during laparoscopic and open cholecystectomy. The British Journal of Surgery 1993;80(10):1252‐4. [PUBMED: 8242290] - PubMed
McMahon 1994
-
- McMahon AJ, Russell IT, Ramsay G, Sunderland G, Baxter JN, Anderson JR, et al. Laparoscopic and minilaparotomy cholecystectomy: a randomized trial comparing postoperative pain and pulmonary function. Surgery 1994;115(5):533‐9. [PUBMED: 8178250] - PubMed
McMahon 1994a
-
- McMahon AJ, Russell IT, Baxter JN, Ross S, Anderson JR, Morran CG, et al. Laparoscopic versus minilaparotomy cholecystectomy: a randomised trial. Lancet 1994;343(8890):135‐8. [PUBMED: 7904002] - PubMed
Moher 1998
-
- Moher D, Pham B, Jones A, Cook DJ, Jadad AR, Moher M, et al. Does quality of reports of randomised trials affect estimates of intervention efficacy reported in meta‐analyses?. Lancet 1998;352(9128):609‐13. [PUBMED: 9746022] - PubMed
Mühe 1986
-
- Mühe E. The first cholecystectomy by laparoscope [Die erste Cholecystektomie durch das Laparoskop]. Langenbecks Archiv für Chirurgie 1986;369:804.
Neugebauer 1995
-
- Neugebauer E, Troidl H, Kum CK, Eypasch E, Miserez M, Paul A. The E.A.E.S. Consensus Development Conferences on laparoscopic cholecystectomy, appendectomy, and hernia repair. Consensus statements‐‐September 1994. The Educational Committee of the European Association for Endoscopic Surgery. Surgical Endoscopy 1995;9(5):550‐63. [PUBMED: 7676385] - PubMed
NIH Consensus conference 1993
-
- NIH Consensus conference. Gallstones and laparoscopic cholecystectomy. Journal of the American Medical Association 1993;269(8):1018‐24. [PUBMED: 8429583] - PubMed
Nilsson 2004
-
- Nilsson E, Ros A, Rahmqvist M, Backman K, Carlsson P. Cholecystectomy: costs and health‐related quality of life: a comparison of two techniques. International Journal for Quality in Health Care 2004;16(6):473‐82. [PUBMED: 15557357] - PubMed
O'Dwyer 1990
-
- O'Dwyer PJ, Murphy JJ, O'Higgins NJ. Cholecystectomy through a 5 cm subcostal incision. The British Journal of Surgery 1990;77(10):1189‐90. [PUBMED: 2224473] - PubMed
Olsen 1991
-
- Olsen DO. Laparoscopic cholecystectomy. American Journal of Surgery 1991;161(3):339‐44. [PUBMED: 1825754] - PubMed
Olsen 1993
-
- Olsen DO. Mini‐lap cholecystectomy. American Journal of Surgery 1993;165(4):440‐3. [PUBMED: 8480878] - PubMed
Oostenbrink 2002
-
- Oostenbrink JB, Koopmanschap MA, Rutten FF. Standardisation of costs: the Dutch Manual for Costing in economic evaluations. PharmacoEconomics 2002;20(7):443‐54. [PUBMED: 12093300] - PubMed
Papanikolaou 2006
Roslyn 1993
Schulz 1995
-
- Schulz KF, Chalmers I, Hayes RJ, Altman DG. Empirical evidence of bias. Dimensions of methodological quality associated with estimates of treatment effects in controlled trials. Journal of the American Medical Association 1995;273(5):408‐12. [PUBMED: 7823387] - PubMed
Scott 1992
-
- Scott EA, Black N. Appropriateness of cholecystectomy: the public and private sectors compared. Annals of the Royal College of Surgeons of England 1992;74(4 Suppl):97‐101. [PUBMED: 1416696] - PubMed
Seale 1999
-
- Seale AK, Ledet WP Jr. Minicholecystectomy: a safe, cost‐effective day surgery procedure. Archives of Surgery (Chicago, Ill.: 1960) 1999;134(3):308‐10. [PUBMED: 10088574] - PubMed
Secco 2002
-
- Secco GB, Cataletti M, Bonfante P, Baldi E, Davini MD, Biasotti B, et al. Laparoscopic versus mini‐cholecystectomy: analysis of hospital costs and social costs in a prospective randomized study [Video‐colecistectomia versus mini‐colecistectomia: analisi dei costi ospedalieri e dei costi sociali in uno studio prospettico randomizzato]. Chirurgia Italiana 2002;54(5):685‐92. [PUBMED: 12469466] - PubMed
Shea 1996
Siegel 1997
-
- Siegel JE, Torrance GW, Russell LB, Luce BR, Weinstein MC, Gold MR. Guidelines for pharmacoeconomic studies. Recommendations from the panel on cost effectiveness in health and medicine. Panel on cost Effectiveness in Health and Medicine. PharmacoEconomics 1997;11(2):159‐68. [PUBMED: 10172935] - PubMed
Southern Surgeons Club 1991
-
- The Southern Surgeons Club. A prospective analysis of 1518 laparoscopic cholecystectomies. The New England Journal of Medicine 1991;324(16):1073‐8. [PUBMED: 1826143] - PubMed
Squirrell 1998
-
- Squirrell DM, Majeed AW, Troy G, Peacock JE, Nicholl JP, Johnson AG. A randomized, prospective, blinded comparison of postoperative pain, metabolic response, and perceived health after laparoscopic and small incision cholecystectomy. Surgery 1998;123(5):485‐95. [PUBMED: 9591000] - PubMed
Srivastava 2001
-
- Srivastava A, Srinivas G, Misra MC, Pandav CS, Seenu V, Goyal A. Cost‐effectiveness analysis of laparoscopic versus minilaparotomy cholecystectomy for gallstone disease. A randomized trial. International Journal of Technology Assessment in Health Care 2001;17(4):497‐502. [PUBMED: 11758294] - PubMed
Steiner 1994
-
- Steiner CA, Bass EB, Talamini MA, Pitt HA, Steinberg EP. Surgical rates and operative mortality for open and laparoscopic cholecystectomy in Maryland. The New England Journal of Medicine 1994;330(6):403‐8. [PUBMED: 8284007] - PubMed
Sweeting 2004
-
- Sweeting MJ, Sutton AJ, Lambert PC. What to add to nothing? Use and avoidance of continuity corrections in meta‐analysis of sparse data. Satistics in Medicine 2004;23(9):1351‐75. - PubMed
Thorlund 2009
-
- Thorlund K, Devereaux PJ, Wetterslev J, Guyatt G, Ioannidis JP, Thabane L, et al. Can trial sequential monitoring boundaries reduce spurious inferences from meta‐analyses?. International Journal of Epidemiology 2009;38(1):276‐86. [PUBMED: 18824467] - PubMed
Traverso 1976
-
- Traverso LW. Carl Langenbuch and the first cholecystectomy. American Journal of Surgery 1976;132(1):81‐2. [PUBMED: 782269] - PubMed
Tyagi 1994
Vist 2005
Vist 2008
-
- Vist GE, Bryant D, Somerville L, Birminghem T, Oxman AD. Outcomes of patients who participate in randomised controlled trials compared to similar patients receiving similar interventions who do not participate. Cochrane Database of Systematic Reviews 2008, Issue 3. [DOI: 10.1002/14651858.MR000009.pub4] - DOI - PMC - PubMed
Vitale 1991
-
- Vitale GC, Collet D, Larson GM, Cheadle WG, Miller FB, Perissat J. Interruption of professional and home activity after laparoscopic cholecystectomy among French and American patients. American Journal of Surgery 1991;161(3):396‐8. [PUBMED: 1825766] - PubMed
Wetterslev 2008
-
- Wetterslev J, Thorlund K, Brok J, Gluud C. Trial sequential analysis may establish when firm evidence is reached in cumulative meta‐analysis. Journal of Clinical Epidemiology 2008;61(1):64‐75. [PUBMED: 18083463] - PubMed
Winkel 2007
-
- Winkel P. Statistical Development of Quality in Medicine. John Wiley & Sons, Inc., 2007.
Publication types
MeSH terms
LinkOut - more resources
Full Text Sources
Medical