[1
]
Department of Hysteroscopic Centre, Fuxing Hospital, the Eighth Clinical Medical College
(Drs. Song, Huang, Zhou, Guo, Xia, Li, Yang and Ma), Capital Medical University, Beijing.
[2
]
Department of Obstetrics and Gynecology, Beijing Tiantan Hospital, the Fifth Clinical
Medical College (Dr. Shi), Capital Medical University, Beijing.
[3
]
Department of Hysteroscopic Centre, Fuxing Hospital, the Eighth Clinical Medical College
(Drs. Song, Huang, Zhou, Guo, Xia, Li, Yang and Ma), Capital Medical University, Beijing;
Assisted Reproductive Technology Unit, Department of Obstetrics and Gynecology, Prince
of Wales Hospital, Chinese University of Hong Kong, Hong Kong (Dr. Li), China.. Electronic
address: tinchiu.li@gmail.com.