1. Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea.
2. Department of Nursing, Nambu University, Gwangju, Korea.
3. Department of Preventive Medicine and Institute of Wonkwang Medical Science, Wonkwang University School of Medicine, Iksan, Korea.
4. Department of Preventive Medicine, Chosun University Medical School, Gwangju, Korea.
5. Jeonnam Regional Cancer Center, Chonnam National University Hwasun Hospital, Hwasun, Korea.