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1Center for Cohort Studies, Total Healthcare Center, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
2Informatization Department, Ewha Womans University Seoul Hospital, Seoul, Korea
3Departments of Preventive Medicine, Kyung Hee University School of Medicine, Seoul, Korea
4Department of Occupational and Environment Medicine, Ewha Womans University College of Medicine, Seoul, Korea
5Department of Occupational and Environmental Medicine, Kyung Hee University Hospital, Seoul, Korea
6Department of Obstetrics and Gynecology, Kyung Hee University Hospital, Seoul, Korea
7Department of Anesthesiology and Pain Medicine, Kyung Hee University Hospital, Seoul, Korea
8Departments of Occupational and Environmental Medicine, Kyung Hee University School of Medicine, Seoul, Korea
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