1. Department of Nuclear Medicine, First Affiliated Hospital of Dalian Medical University, Liaoning 116021, People’s Republic of China
2. Department of Pathology, First Affiliated Hospital of Dalian Medical University, Liaoning 116021, People’s Republic of China
3. School of Biomedical Engineering and Imaging Sciences, King’s College London, St. Thomas’ Hospital, London SE1 7EH, U.K.