1. Department of Occupational Health, College of Bio-Medical Sciences, Daegu Catholic University, Daegu, Republic of Korea
2. Institute of Health & Environment, Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea
3. Technology Services Division, National Institute of Animal Science, Wanju, Republic of Korea
4. Animal Environment Division, National Institute of Animal Science, Wanju, Republic of Korea
5. Technology Services Department, Gyeonggi Agricultural Research Extension Services, Hwaseong, Republic of Korea
6. Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea