Letter: Steroid profile of threatened premature labour.
D004958:Estradiol / Q000097:blood*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007752:Obstetric Labor, Premature / Q000097:blood* / Q000517:prevention & control; D011247:Pregnancy; D011248:Pregnancy Complications / Q000097:blood; D011374:Progesterone / Q000097:blood*
D011374:Progesterone; D004958:Estradiol