1. Department of Obstetrics and Gynecology, Porto Hospital Center, Porto, Portugal.
2. Department of Obstetrics and Gynecology, Makati Medical Center, Metro Manila, Philippines.
3. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou Medical Center and Chang Gung University College of Medicine, Kwei-Shan, Tao-Yuan, Taiwan.
4. Department of Pathology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, Kwei-Shan, Tao-Yuan, Taiwan.