1. Division of Hematology/Oncology, Department of Medicine, New York Medical College, Valhalla, New York, United States
2. Division of Hematology/Oncology, Department of Medicine, University of Iowa, Iowa City, Iowa, United States
3. Department of Oncology, Henan Province People's Hospital, Zhengzhou University, Zhengzhou, China
4. Department of Oncology, Henan Cancer Hospital and the Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, China