Document Type : Research Articles
Authors
1 1Hebei Province Key Laboratory of Occupational Health and Safety for Coal Industry, School of Public Health, North China University of Science and Technology, No. 21 Bohai Road, Caofeidian District, Tangshan, Hebei Province, China.
2 Tangshan City Center for Disease Control and Prevention, 52 North Weiguo Road, Tangshan, Hebei Province, China.
Abstract
Keywords
Main Subjects