1. Department of Medical Oncology, Beijing Key Laboratory of Clinical Study on Anticancer Molecular Targeted Drugs, National Cancer Center/Cancer Hospital; Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing 100021 P. R. China
2. Department of Lymphoma, Beijing Cancer Hospital; Peking University; Beijing 100142 P. R. China
3. Department of Hematology, Ruijin Hospital; Shanghai Jiaotong University; Shanghai 200025 P. R. China
4. Department of Hematology; Guangdong General Hospital/Guangdong Academy of Medical Sciences; Guangzhou 510030 Guangdong P. R. China
5. Clinical Science; Shanghai Roche Pharmaceuticals Ltd; Shanghai 201203 P. R. China
6. Statistics; Roche (China) Holding Ltd; Shanghai 201203 P. R. China