1. Seoul National University Medical Research Center, Seoul 03080, Korea.
2. Department of Nutritional Science and Food Management, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea.
3. Seoul National University Health Service Center, Seoul 08826, Korea.
4. Health Promotion Center, Chung-Ang University Hospital, Seoul 06973, Korea.
5. Department of Family Medicine, SMG - SNU Boramae Medical Center, 20, Boramae-ro 5-gil, Dongjak-gu, Seoul 07061, Korea.