1. Department of Hematology, Lymphoma Research Center, Peking University Third Hospital, Beijing 100191, P.R. China
2. Department of General Surgery, Chinese People's Liberation Army General Hospital, Beijing 100853, P.R. China
3. Department of Pathology, Beijing Tiantan Hospital Affiliated with Capital Medical University, Beijing 100050, P.R. China
4. Department of Respiratory Medicine, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Guangdong 341000, P.R. China
5. Department of Pathology, Chinese People's Liberation Army General Hospital, Beijing 100853, P.R. China