1. Department of Public Health, Graduate SchoolKorea University Seoul Korea
2. Department of Nursing, College of NursingDankook University Cheonan Korea
3. Department of Internal MedicineUlsan University Hospital Ulsan Korea
4. Department of Internal MedicineSchool of Medicine, Ewha Womans University Seoul Korea
5. Department of Preventive MedicineUniversity of Ulsan College of Medicine Seoul Korea