title: Is preterm labor a valid endpoint in perinatal research?
authors.affiliation: Department of Obstetrics and Gynecology, Leonard Davis Institute of Health Economics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA. gmacones@mail.obgyn.upenn.edu
authors.forename: George A
authors.initials: GA
authors.lastname: Macones
mesh_terms: D000328:Adult; D023381:Endpoint Determination; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007752:Obstetric Labor, Premature; D011247:Pregnancy; D012107:Research Design; D012307:Risk Factors