1. Maternity and Perinatal Care Center, Nagoya University Hospital, Nagoya, Japan; the Department of Pediatrics, Nagoya University Graduate School of Medicine, Nagoya, Japan; and the Department of Pediatrics, Tousei General Hospital, Seto, Japan; Maternity and Perinatal Care Center, Nagoya University Hospital, 65 Tsurumai-cho, Showa-ku Nagoya, 466-8550 Japan
2. Maternity and Perinatal Care Center, Nagoya University Hospital, Nagoya, Japan; the Department of Pediatrics, Nagoya University Graduate School of Medicine, Nagoya, Japan; and the Department of Pediatrics, Tousei General Hospital, Seto, Japan