Frozen versus fresh single blastocyst transfer in ovulatory women: a multicentre, randomised controlled trial

Ministry of Education of the People's Republic of China, Shandong University, Third Affiliated Hospital of Guangzhou Medical University, Nanjing Medical University, Jiangsu Province Hospital, Guangzhou Medical University, State Key Laboratory of Reproductive Medicine, Shanghai Jiao Tong University, Renji Hospital, Guangxi Maternal and Child Health Hospital, China Medical University, Sun Yat-sen University, Anhui Medical University, First Affiliated Hospital of Anhui Medical University, Qingdao Women and Children's Hospital, Qingdao University, Shenyang 242 Hospital, Hebei Medical University, Second Hospital of Hebei Medical University, Nanjing Maternity and Child Health Care Hospital, Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University, Wenzhou Medical University, Tianjin Central Hospital of Gynecology Obstetrics, Affiliated Hospital of Qingdao University, Weifang Medical University, Qilu Hospital of Shandong University, Sun Yat-sen Memorial Hospital, Women's Hospital, School of Medicine, Zhejiang University, Air Force Medical University, Jiangxi Maternal and Child Health Hospital, Sichuan Provincial Hospital of Traditional Chinese Medicine, Yale University, Penn State Milton S. Hershey Medical Center