1 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan (Drs. Y.-T. Huang, Wu, Su and Wang).
2 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Taipei, Taiwan (Dr. H.-Y. Huang).
3 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan (Drs. Y.-T. Huang, Wu, Su and Wang); Chang Gung University College of Medicine, Taoyuan, Taiwan (Drs. Wu and Wang).
4 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan (Drs. Y.-T. Huang, Wu, Su and Wang); Chang Gung University College of Medicine, Taoyuan, Taiwan (Drs. Wu and Wang). Electronic address: wang2260@gmail.com.