1. Department of Human Anatomy, School of Basic Medical Sciences, North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
2. General Practice, Pingjiang Xincheng Community Health Service Center, Suzhou, Jiangsu 215101, P.R. China
3. Medical Experimental Center, Jitang College of North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
4. School Hospital, Hengshui University, Hengshui, Hebei 053010, P.R. China
5. Department of Life Sciences, Hengshui University, Hengshui, Hebei 053010, P.R. China