1. Department of Family Medicine; Seoul National University Boramae Hospital; 20 Boramae-ro 5-gil Dongjak-gu Seoul 07061 Republic of Korea
2. Department of internal Medicine; Seoul National University Boramae Hospital; 20 Boramae-ro 5-gil Dongjak-gu Seoul 07061 Republic of Korea
3. Department of Life Science; Hallym University; Chuncheon Gangwon-do 200-702 Republic of Korea