Takashi Nagata1, Masami Ishii2. 1. Assistant Professor, Department of Advanced Medical Initiatives, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan; Visiting Researcher, Japan Medical Association Research Institute (JMARI), Tokyo, Japan ( nagata.takashi@gmail.com ). 2. Executive Board Member, Japan Medical Association, Tokyo, Japan ( jmaintl@po.med.or.jp ).