Collaborators: Maternal and Children's Healthcare Hospital of Taian, Inner Mongolia People's Hospital, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Women's Hospital School Of Medicine Zhejiang University, the Maternal and Child Health Hospital of Hainan Province, Women and Children Hospital of Qinghai Province, First Affiliated Hospital of Xinjiang Medical University, Gansu Provincial Maternal and Child Health Care Hospital, The Affiliated Hospital Of Southwest Medical University, Peking University Third Hospital, Women and Children's Hospital, Branch of Chongqing Sanxia Central Hospital, First Affiliated Hospital of Harbin Medical University, The First Hospital of Jilin University, First Hospital of Tsinghua University, Beijing 302 Hospital, Qinhuangdao Maternal and Child Health Care Hospital, Affiliated Hospital of Southwest Medical University, Guangdong Women and Children Hospital, The Second Hospital of Shandong University, Chengdu Women and Children's Center Hospital, Shenzhen People's Hospital, The Second Medical College of Jinan University, Children's Hospital of Nanjing Medical University, Ningbo Women & Children's Hospital, The First People's Hospital of Zunyi, People's Liberation Army No.202 Hospital, Children's Hospital of Fudan University, Jiulongpo No.1 People's Hospital, Second Affiliated Hospital of Guangzhou Medical University, Nanjing Medical University, Tianjin Central Hospital of Gynecology Obstetrics, First Affiliated Hospital of Chongqing Medical University, Kunming Children's Hospital, Yan'an Affiliated Hospital of Kunming Medical University, Xiamen Maternity & Child Care Hospital, Bethune International Peace Hospital, Children's Hospital of The Capital Institute of Pediatrics, The Children's Hospital of Zhejiang University School of Medicine, First Affiliated Hospital of Guangxi Medical University, People's Hospital of Xinjiang Uygur Autonomous Region, Women and Children's Health Hospital of Qujing, Children's Hospital of Chongqing Medical University, Hunan Children's Hospital, First Affiliated Hospital of Kunming Medical University, Mianyang Central Hospital, Xianyang Children's Hospital, Nanfang Hospital, Southern Medical University, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Shanxi Provincial Maternity and Children's Hospital, Women and Children's Health Hospital of Yulin, Chongqing Maternal and Child Health Hospital, Lanzhou University Second Hospital, Zhujiang Hospital, Guangdong Academy of Medical Science and General Hospital, The People's Hospital of Dehong Autonomous Prefecture, Third Affiliated Hospital of Zhengzhou University, LanZhou University, The First People's Hospital of Yinchuan, The First Affiliated Hospital of Anhui Medical University, Jiangxi Province Children's Hospital, The First People's Hospital of Yunnan, Xuzhou Children Hospital, Guiyang Maternal and Child Health Care Hospital, Shanghai Children's Medical Center, Quanzhou Children's Hospital, Zhengzhou Children's Hospital, China