[Elsevier]
Use of serum evaluation of contraceptive and ovarian hormones to assess reduced risk of pregnancy among women presenting for emergency contraception in a multicenter clinical trial
Authors:Jeffrey T. Jensen; Alison Edelman; Carolyn L. Westhoff; Coutney A. Schreiber; David F. Archer; Stephanie Teal; Michael Thomas; Jill Brown; Diana L. Blithe