1. Department of Surgery, Jinan Central Hospital, Jinan 250021, China
2. Department of Radiology, Hospital of the University of Pennsylvania, 6 Founders, 3400 Spruce Street, Philadelphia, PA 19104, USA
3. Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, 6 Founders, 3400 Spruce Street, Philadelphia, PA 19104, USA