1 Department of Radiation Oncology, Taichung Veterans General Hospital, 40705, Taichung, Taiwan.
2 Department of Obstetrics and Gynecology, Taichung Veterans General Hospital, 40705, Taichung, Taiwan.
3 Department of Radiation Oncology, Taichung Veterans General Hospital, 40705, Taichung, Taiwan; Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taiwan. Electronic address: llwang1212@gmail.com.