Premature labor.
Ferguson
B
B
D000293:Adolescent; D000328:Adult; D005193:Family Planning Services; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000453:epidemiology / Q000517:prevention & control*; D011247:Pregnancy; D012307:Risk Factors; D014481:United States