1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of
Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian 361003, P.R. China
2. Department of
Orthopedics, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen,
Fujian 361003, P.R. China
3. Department of Anesthesiology, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University,
Xiamen, Fujian 361003, P.R. China