1. Department of Occupational and Environmental Medicine, College of Medicine, Seoul St. Mary’s Hospital, Catholic University of Korea , Seoul, Republic of Korea
2. Department of Preventive Medicine, College of Medicine, Catholic University of Korea , Seoul, Republic of Korea
3. Division of Nephrology, Department of Internal Medicine, College of Medicine, Seoul St. Mary’s Hospital, Catholic University of Korea , Seoul, Republic of Korea
4. Section of Environmental Health, Department of Public Health, University of Copenhagen , Copenhagen, Denmark