Department of Organ Transplantation, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China. Department of Pathology, The Third Affiliated Hospital of Guangzhou Medical University, 63 Duobao Road, Guangzhou, 510150, People's Republic of China. Department of Ultrasound, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China. Department of Pathology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China. Department of Clinical Laboratory, Guangzhou Kingmed Center for Clinical Laboratory Co., Ltd, Guangzhou, 510330, China. Department of Pathology, The Third Affiliated Hospital of Guangzhou Medical University, 63 Duobao Road, Guangzhou, 510150, People's Republic of China. pengjuan1979@yahoo.com.