1 Department of Internal Medicine, Jeonbuk National University Medical School, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54907 Republic of Korea.
2 Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Republic of Korea.
3 Department of Preventive Medicine, Konyang University College of Medicine, Daejeon, Republic of Korea.