1. Department of Occupational and Environmental Medicine, Kosin University Gospel Hospital, Busan, Republic of Korea
2. Department of Statistics, University of Michigan, Ann Arbor, MI, USA
3. Department of Biomedical Informatics, School of Medicine, Pusan National University, Yangsan, Republic of Korea
4. Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Republic of Korea
5. Department of Occupational and Environmental Medicine, Gwanghwamun Center, Korea Medical Institute, Seoul, Republic of Korea
6. Department of Occupational and Environmental Medicine, Kosin University College of Medicine, Busan, Republic of Korea