1. Center for Disease Control and Prevention of Changning District; Shanghai China
2. Division of Epidemiology, Vanderbilt Epidemiology Center, Department of Medicine; Vanderbilt University School of Medicine; Nashville Tennessee USA
3. State Key Laboratory of Oncogene and Related Genes and Department of Epidemiology; Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine; Shanghai China
4. Department of Epidemiology, School of Public Health; Fudan University; Shanghai China