1. First Department of Internal Medicine; School of Medicine; University of Occupational and Environmental Health; Japan
2. Department of Internal Medicine; Japan Labour Health and Welfare Organization Kyushu Rosai Hospital; Moji Medical Center; Kitakyushu Japan
3. Department of Cardiovascular Medicine; Osaka University Graduate School of Medicine; Osaka Japan
4. Department of Community Medicine; Osaka University Graduate School of Medicine; Osaka Japan