Heyborne, Kent D Do maternal obesity or smoking explain the lack of effectiveness of 17-alpha hydroxyprogesterone caproate? [electronic resource] - American journal of obstetrics and gynecology 11 2017 - 621 p. digital Publication Type: Letter; Comment ISSN: 1097-6868 Standard No.: 10.1016/j.ajog.2017.07.014 doi Subjects--Topical Terms: CaproatesFemaleHumansHydroxyprogesteronesPregnancySmoking