1. Department of Cardiology; Gunma Children's Medical Center; Gunma Japan
2. Department of Pediatrics; Gunma University Graduate School of Medicine; Gunma Japan
3. Department of Cardiovascular Surgery; Gunma Children's Medical Center; Gunma Japan
4. Department of Pediatric Cardiology; Osaka Medical Center and Research Institute for Maternal and Child Health; Osaka Japan
5. Department of Obstetrics; Gunma Children's Medical Center; Gunma Japan