title: Author Reply.
authors.affiliation: Center for Reproductive Medicine, Tianjin Central Hospital of Obstetrics and Gynecology, Tianjin, China.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Cui
authors.affiliation: Center for Reproductive Medicine, Tianjin Central Hospital of Obstetrics and Gynecology, Tianjin, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Ding
authors.affiliation: Center for Reproductive Medicine, Tianjin Central Hospital of Obstetrics and Gynecology, Tianjin, China.
authors.forename: Ge
authors.initials: G
authors.lastname: Gao
authors.affiliation: Center for Reproductive Medicine, Tianjin Central Hospital of Obstetrics and Gynecology, Tianjin, China.
authors.forename: Yunshan
authors.initials: Y
authors.lastname: Zhang