N Engl J Med. 2000 Jun 22;342(25):1907-9.

Randomized trials or observational tribulations?

Pocock SJ, Elbourne DR.

Comment in

Observational studies and randomized trials. [N Engl J Med. 2000]
Observational studies and randomized trials.Friedman HS. N Engl J Med. 2000 Oct 19; 343(16):1195-6; author reply 1196-7.

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A comparison of observational studies and randomized, controlled trials. [N Engl J Med. 2000]
A comparison of observational studies and randomized, controlled trials.Benson K, Hartz AJ. N Engl J Med. 2000 Jun 22; 342(25):1878-86.
Randomized, controlled trials, observational studies, and the hierarchy of research designs. [N Engl J Med. 2000]
Randomized, controlled trials, observational studies, and the hierarchy of research designs.Concato J, Shah N, Horwitz RI. N Engl J Med. 2000 Jun 22; 342(25):1887-92.

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Randomized, controlled trials, observational studies, and the hierarchy of research designs. [N Engl J Med. 2000]
Randomized, controlled trials, observational studies, and the hierarchy of research designs.
Concato J, Shah N, Horwitz RI. N Engl J Med. 2000 Jun 22; 342(25):1887-92.
A comparison of observational studies and randomized, controlled trials. [N Engl J Med. 2000]
A comparison of observational studies and randomized, controlled trials.
Benson K, Hartz AJ. N Engl J Med. 2000 Jun 22; 342(25):1878-86.
Observational studies and randomized trials. [N Engl J Med. 2000]
Observational studies and randomized trials.
Kunz R, Khan KS, Neumayer HH. N Engl J Med. 2000 Oct 19; 343(16):1194-5; author reply 1196-7.
Review From randomized controlled trials to observational studies. [Am J Med. 2009]
Review From randomized controlled trials to observational studies.
Silverman SL. Am J Med. 2009 Feb; 122(2):114-20.
Review Observational evidence. [Ann N Y Acad Sci. 1993]
Review Observational evidence.
Hennekens CH, Buring JE. Ann N Y Acad Sci. 1993 Dec 31; 703:18-24; discussion 24.

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