1. Department of Pediatrics Hirosaki University Hospital Hirosaki Japan
2. Department of Pediatrics, Renal Research Laboratory Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
3. Department of Pediatrics Kobe University Graduate School of Medicine Kobe Japan
4. Department of Pathology The Jikei Medical University Tokyo Japan
5. Department of School Health Science Hirosaki University Faculty of Education Hirosaki Japan