Randomized trials or observational tribulations?

Editorial

S J Pocock et al. N Engl J Med. 2000.

. 2000 Jun 22;342(25):1907-9.

doi: 10.1056/NEJM200006223422511.

No abstract available

Comment in

Observational studies and randomized trials.
Friedman HS. Friedman HS. N Engl J Med. 2000 Oct 19;343(16):1195-6; author reply 1196-7. N Engl J Med. 2000. PMID: 11041760 No abstract available.

A comparison of observational studies and randomized, controlled trials.
Benson K, Hartz AJ. Benson K, et al. N Engl J Med. 2000 Jun 22;342(25):1878-86. doi: 10.1056/NEJM200006223422506. N Engl J Med. 2000. PMID: 10861324
Randomized, controlled trials, observational studies, and the hierarchy of research designs.
Concato J, Shah N, Horwitz RI. Concato J, et al. N Engl J Med. 2000 Jun 22;342(25):1887-92. doi: 10.1056/NEJM200006223422507. N Engl J Med. 2000. PMID: 10861325 Free PMC article.