S H Kim1, M W Jo2, J Ahn3, S Shin3, M Ock2, J Park4, N Luo5. 1. Dankook University, Cheonan, South Korea. 2. University of Ulsan, Seoul, South Korea. 3. National Evidence-based health care Collaborating Agency, Seoul, South Korea. 4. National Evidence-based Healthcare Collaborating Agency (NECA), Seoul, South Korea. 5. Saw Swee Hock School of Public Health, National University of Singapore, Singapore.