1Department of Pediatrics, Kashiwara Municipal Hospital, Kashiwara, Japan
2Department of Public Health, Osaka City University, Graduate School of Medicine, Osaka, Japan
3Department of Pediatrics, Kyorin University, School of Medicine, Tokyo, Japan
4Department of Pediatrics, Osaka City University, Graduate School of Medicine, Osaka, Japan
*Corresponding e-mail: setot@med.osaka-cu.ac.jp
Online published on 1 October, 2020.