1 Section of Epidemiology and Population Science, Department of Medicine, Baylor College of Medicine, Houston, TX, United States.
2 The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Cancer Research Institute and School of Basic Medicine, Central South University, Changsha, China.
3 Hematopathology Division, Department of Pathology, Duke University Medical Center, Durham, NC, United States.