Ren He-Ya, Sun Zhi-Jing, Zhu Lan, Lang Jing-He, Pan Hui, Wu Xia
Department of Obstetrics and Gynaecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing 100730, China.
Department of Education, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing 100730, China.
Chin Med J (Engl). 2017 Apr 20;130(8):997-1000. doi: 10.4103/0366-6999.204116.