Invited commentary.
Stephens
Andrea
A
Department of Obstetrics and Gynecology, Washington University School of Medicine, St Louis, MO 63110, USA. Stephensa@wudosis.wustl.edu
D015444:Exercise; D005260:Female; D006801:Humans; D017410:Practice Guidelines as Topic; D011247:Pregnancy; D011295:Prenatal Care