1 Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.
2 Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital Pingtung Branch, Pingtung, Taiwan; Department of Healthcare Administration and Medical Informatics, Kaohsiung Medical University, Kaohsiung, Taiwan. Electronic address: taylor6174@gmail.com.