1. Department of Pediatrics, Akita University Graduate School of Medicine, Akita 010-8543, Japan
2. Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8602, Japan
3. Department of Child Health, Faculty of Medicine, University of Tsukuba, Tsukuba 305-8546, Japan
4. Department of Pediatrics, Saitama Medical Center, Saitama Medical University, Kawagoe 350-8550, Japan
5. Department of Neonatology, Akita Red Cross Hospital, Akita 010-1495, Japan
6. Global Health Nursing, Graduate School of Nursing Sciences, St. Luke’s International University, Chuo 104-0044, Japan
7. Tokyo Foundation for Policy Research, Tokyo 106-6234, Japan
8. Research and Development Center for New Medical Frontiers, Department of Advanced Medicine, Division of Neonatal Intensive Care Medicine, Kitasato University School of Medicine, Sagamihara 252-0375, Japan