1. Department of Internal Medicine; Niigata University; Niigata Japan
2. Department of Laboratory Medicine and Clinical Epidemiology for Prevention of Noncommunicable Diseases; Graduate School of Medical and Dental Sciences; Niigata University; Niigata Japan
3. Niigata Association of Occupational Health; Niigata Japan
4. Department of Pharmacoepidemiology; Graduate School of Medicine and Public Health; Kyoto University; Kyoto Japan