1. Department of Environmental Medicine, School of Medicine, Ewha Womans University, Seoul, Korea.
2. Graduate Program in System Health Science and Engineering, College of Medicine, Ewha Womans University, Seoul, Korea.
3. Department of Occupational and Environmental Medicine, Ewha Womans University Mokdong Hospital, Seoul, Korea.
4. Department of Occupational and Environmental Medicine, Catholic Kwandong University International St. Mary’s Hospital, Incheon, Korea.
5. Department of Preventive Medicine, College of Medicine, Hanyang University, Seoul, Korea.
6. School of Public Health, Hanyang University, Seoul, Korea.