Institution: | 1. Reproductive Medicine Centre, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, China;2. Department of Anesthesia, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, China;3. Department of Orthopedics, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, China |