1. Department of Human Ecology, Graduate School, Korea University, Seoul 02841, Korea.
2. Interdisciplinary Program in Sustainable Living System, Graduate School, Korea University, Seoul 02841, Korea.
3. BK21 FOUR Research & Education Center for Sustainable Living System, Korea University, Seoul 02841, Korea.
4. Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul 08826, Korea.
5. Department of Rehabilitation, Exercise, and Nutrition Sciences, College of Allied Health Sciences, University of Cincinnati, Cincinnati, OH 45221, USA.