1. Department of Family Medicine, Seoul National University Bundang Hospital, Seongnam-si 13620, Republic of Korea
2. Health Promotion Center, Seoul Bumin Hospital, Seoul 07590, Republic of Korea
3. Bionutrion Corp., Seoul 06097, Republic of Korea
4. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea