1. Department of Orthopedics, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
2. Division of Neurosurgery, Department of Surgery, Changhua Christian Hospital, Changhua, Taiwan
3. College of Nursing and Health Sciences, Dayeh University, Changhua, Taiwan
4. School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan