1. Cancer Institute the Fourth Hospital of Hebei Medical University/the Tumor Hospital of Hebei Province Shijiazhuang Hebei 050000 P. R. China
2. Zhejiang Cancer Center Hangzhou Zhejiang 310000 P. R. China
3. Henan Cancer Hospital Zhengzhou Henan 450000 P. R. China
4. Beijing Cancer Hospital Beijing 100021 P. R. China
5. Hubei Cancer Hospital Wuhan Hubei 430000 P. R. China
6. Zhongshan Cancer Hospital Zhongshan Guangdong 528400 P. R. China
7. National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Science & Peking Union Medical College Beijing 100021 P. R. China