1. Department of Nutritional Science and Food Management, Ewha Womans University, Seoul, Korea
2. Department of Preventive Medicine, College of Medicine, Ewha Womans University, Seoul, Korea
3. Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea
4. Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea
5. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea