Overview Letrozole and Sequential Clomiphene to Improve the Outcome of Embryo Transfer Status: Unknown status Trial end date: 2020-01-01 Target enrollment: Participant gender: Summary The purpose of this study is to study the effects of letrozole and sequential clomiphene in ovulation and pregnancy in PCOS patients. Phase: N/A Details Lead Sponsor: Navy General Hospital, BeijingTreatments: ClomipheneEnclomipheneLetrozoleZuclomiphene