J Pediatr Hematol Oncol 2017 04;39(3):e167-e172
*Department of Pediatrics, St. Luke's International Hospital, Chuo-ku, Tokyo †Pediatric Medical Center, Ehime Prefectural Central Hospital, Matsuyama, Ehime ‡Center for Clinical Epidemiology §Research Center, St. Luke's International University, Chuo-ku, Tokyo, Japan.