1. Department of Pediatrics; Asahikawa Medical University; 2-1-1-1 Midorigaoka Higashi; Asahikawa; 078-8510; Japan
2. Department of Internal Medicine; Kawanishi City Hospital; Kawanishi; 666-0195; Japan
3. Department of Medical Laboratory and Blood Center; Asahikawa Medical University Hospital; 2-1-1-1 Midorigaoka Higashi; Asahikawa; 078-8510; Japan