1. Department of Haematology, Osaka City University Graduate School of Medicine, Osaka, Japan
2. Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
3. Department of Cardiovascular Medicine, Kyotango City Yasaka Hospital, Kyoto, Japan
4. Division of Community Medicine and Career Development, Kobe University Graduate School of Medicine, Kobe, Japan