1. Department of Health Care Administration, Nippon Medical School, Tokyo, Japan
2. Department of Cardiovascular Medicine, Nippon Medical School, Tokyo, Japan
3. Department of Endocrinology, Metabolism and Nephrology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
4. Department of Cardiovascular Medicine, Nippon Medical School Chiba Hokusoh Hospital, Chiba, Japan
5. Department of General Medicine and Health Science, Nippon Medical School, Tokyo, Japan
6. Department of Radiology, Nippon Medical School, Tokyo, Japan