The importance of proper study design.
Dandolu
Vani
V
Brown
Raymond
R
D001720:Birth Injuries / Q000453:epidemiology; D020516:Brachial Plexus Neuropathies / Q000453:epidemiology; D004420:Dystocia / Q000601:surgery; D004841:Episiotomy / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D012107:Research Design / Q000592:standards*