American Journal of Obstetrics and Gynecology · 1991 · 334 citations · 11 references
11
R Amsel, Patricia A. Totten, Carol A. Spiegel et al. · The American Journal of Medicine · 1983 · 2.4K citations
Clinical Epidemiology: The Essentials.
Annals of Internal Medicine · 1991 · 1.9K citations
Clinical epidemiology: The essentials
Pinuccia Valagussa · Controlled Clinical Trials · 1988 · 922 citations