1 School of Public Health, North China University of Science and Technology, Bohai Road 21, Caofeidian Dis, Tangshan, 063210, People's Republic of China.
2 The Second Hospital of Tangshan City, Tangshan, People's Republic of China.
3 Kailuan General Hospital, Tangshan, People's Republic of China.
4 Gongren Hospital, Tangshan, People's Republic of China.
5 Department of Orthopedic Surgery, Affiliated Hospital of North China University of Science and Technology, Jianshe South Road 73, Tangshan, 063000, People's Republic of China. [email protected].
6 School of Public Health, North China University of Science and Technology, Bohai Road 21, Caofeidian Dis, Tangshan, 063210, People's Republic of China. [email protected].