1. Department of Internal Medicine; Chonnam National University Hwasun Hospital; Chonnam National University Medical School; Gwangju; South Korea
2. Department of Surgery; Chonnam National University Medical School; Gwangju; South Korea
3. Department of Preventive Medicine; Chonnam National University Hwasun Hospital; Jeonnam Regional Cancer Center; Chonnam National University Medical School; Gwangju; South Korea