1 Department of Obstetrics and Gynecology, China Medical University Hospital, China Medical University, Taichung, Taiwan. Electronic address: mi.ho@msa.hinet.net.
2 Department of Obstetrics and Gynecology, China Medical University Hospital, China Medical University, Taichung, Taiwan.
3 Department of Pediatrics, China Medical University Hospital, China Medical University, Taichung, Taiwan.