title: Methodological considerations for evaluating preterm birth.
authors.forename: Ronna L
authors.initials: RL
authors.lastname: Chan
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D047928:Premature Birth / Q000208:ethnology* / Q000235:genetics*; D044469:Racial Groups / Q000235:genetics*; D012106:Research / Q000592:standards*