Comment on

• Challenges in using observational studies to evaluate adverse effects of treatment.

  Hughes MD, Williams PL. Hughes MD, et al. N Engl J Med. 2007 Apr 26;356(17):1705-7. doi: 10.1056/NEJMp078038. N Engl J Med. 2007. PMID: 17460224 No abstract available.
• Class of antiretroviral drugs and the risk of myocardial infarction.

  DAD Study Group; Friis-Møller N, Reiss P, Sabin CA, Weber R, Monforte Ad, El-Sadr W, Thiébaut R, De Wit S, Kirk O, Fontas E, Law MG, Phillips A, Lundgren JD. DAD Study Group, et al. N Engl J Med. 2007 Apr 26;356(17):1723-35. doi: 10.1056/NEJMoa062744. N Engl J Med. 2007. PMID: 17460226