1. Department of Oncology, Shanghai Tenth People’s Hospital, Tongji University, School of Medicine, Shanghai, P. R. China
2. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, P. R. China
3. Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
4. Department of Epidemiology, School of Public Health, Rutgers, The State University of New Jersey, Piscataway, NJ, USA