1. Department of Obstetrics and Gynecology, Yee-Zen General Hospital, Tao-Yuan county 326, Taiwan
2. Graduate Institute of Systems Biology and Bioinformatics, National Central University, Jhongli city, Tao-Yuan county 320, Taiwan
3. Institute of Statistics, National Central University, Jhongli city, Tao-Yuan county 320, Taiwan
4. Department of Obstetrics and Gynecology and Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei 112, Taiwan
5. Department of Life Science, National Central University, Jhongli city, Tao-Yuan county 320, Taiwan
6. Department of Medicine, Cheng-Hsin General Hospital, Taipei 112, Taiwan
7. Department of Nursing, Taipei Veterans General Hospital, Taipei 112, Taiwan
8. Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei 112, and National Yang-Ming University Hospital, Ilan 260, Taiwan