1. Total Healthcare Center, School of Medicine Kangbuk Samsung Hospital, Sungkyunkwan University Seoul Korea
2. Ewha Institute of Convergence Medicine Ewha Womans University Mokdong Hospital Seoul Korea
3. Department of Preventive Medicine, School of Medicine Kyung Hee University Seoul Korea
4. Department of Occupational and Environment Medicine, College of Medicine Ewha Womans University Seoul Korea
5. Department of Occupational and Environmental Medicine Kyung Hee University Hospital Seoul Korea
6. Department of Obstetrics and Gynecology Kyung Hee University Hospital Seoul Korea
7. Department of Anesthesiology and Pain Medicine Kyung Hee University Hospital Seoul Korea
8. Department of Occupational and Environmental Medicine, School of Medicine Kyung Hee University Seoul Korea