1. Department of Public Health, Graduate School Chonnam National University Medical School, Gwangju, Korea.
2. Department of Preventive Medicine, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Preventive Medicine & Institute of Wonkwang Medical Science, Wonkwang University College of Medicine, Iksan, Korea.
4. Department of Preventive Medicine, Chungnam National University Medical School, Daejeon, Korea.
5. Cardiocerebrovascular Center, Mokpo Jung-Ang Hospital, Mokpo, Korea.
6. Department of Preventive Medicine, Chosun University Medical School, Gwangju, Korea.