1Department of Occupational and Environmental Medicine, College of Medicine, Dong-A University, Korea. gyjung@daunet.donga.ac.kr
2Department of Occupational and Environmental Medicine, College of Medicine, Pusan Paik Hospital, In-Je University, Korea.
3Masan Samsung Hospital, Korea.
4Koshin Hospital, Korea.
5University of Ulsan, Korea.
6Department of Preventive and Occupational Medicine, College of Medicine, Pusan National University, Korea.
7Occupational Medicine Research Institute, Changwon Patima Hospital, Korea.
8Jinju Korea Hospital, Korea.
9Department of Health Care, Changwon Hospital, Korea.
10Department of Preventive Medicine, College of Medicine, Koshin University, Korea.
11Department of Preventive Medicine, College of Medicine, Dong-A University, Korea.
12Occupational Medicine Center, Daewoo Hospital, Korea.
13Occupational Safety & Health Research Institute, KOSHA, Korea.