1. Department of Public Health, Jiangsu Vocational College of Medicine, Yancheng, Jiangsu 224005, P.R. China
2. Department of Pathology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
3. Department of Medical Imaging and Laboratory, Xiangnan University, Chenzhou, Hunan 423000, P.R. China