1. Department of Laboratory Medicine, Seonam University College of Medicine, Myongji Hospital, Goyang, Korea.
2. Department of Statistics, Pukyong National University College of Natural Science, Busan, Korea.
3. Department of Psychiatry, Dankook University College of Medicine, Cheonan, Korea.
4. Environmental Health Center, Dankook University Medical Center, Cheonan, Korea.
5. Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea.
6. Department of Hospital Management, Yonsei University Graduate School of Public Health, Seoul, Korea.