1998, BMJ, 317, 235, 10.1136/bmj.317.7153.235
10.1097/00003246-199901000-00053
Wilkes MM, 2001, Ann Intern Med, 135, 149, 10.7326/0003-4819-135-3-200108070-00007
Cook D, 2001, Ann Intern Med, 135, 205, 10.7326/0003-4819-135-3-200108070-00013
2001, Ann Intern Med, 135, S
10.1213/01.ANE.0000089961.15975.78
Bunn F, 2003, Cochrane Database Syst Rev, 1, CD001319
10.1097/00003246-198510000-00009
Bernard GR, 1994, Am J Respir Crit Care Med, 149, 818, 10.1164/ajrccm.149.3.7509706
10.1016/S0140-6736(74)91639-0
10.1097/00003246-199811000-00016
Woodward M. Epidemiology: study design and data analysis. Boca Raton, Fla.: Chapman & Hall/CRC Press, 1999.
10.1056/NEJM199902113400601
10.1016/S0140-6736(00)03651-5
10.1089/089771502753754037