1. Queen Mary School Nanchang University Nanchang P. R. China
2. Chinese Evidence‐Based Medicine Center West China Hospital Chengdu P. R. China
3. Center for Evidence‐Based Medicine, School of Public Health Nanchang University Nanchang Jiangxi P. R. China
4. Jiangxi Province Key Laboratory of Preventive Medicine, School of Public Health Nanchang University Nanchang P. R. China