1. Division of Pediatrics; Maternal and Perinatal Care Center; Aizenbashi Hospital; Osaka Japan
2. Division of Neonatology; Maternal and Perinatal Care Center; Kagoshima City Hospital; Kagoshima Japan
3. Division of Neonatology; Fukuda Hospital; Kumamoto Japan
4. Division of Pediatrics; Kurashiki Central Hospital; Kurashiki Japan