1. Jinggangshan University; Branch of Cooperative Research Center on Evidence-based Medicine of Ministry of Education, Department of Preventive Medicine; 23 Jifu Road Ji'an Jiangxi China 343000
2. Nanchang University; The First Affiliated Hospital; 17 Yongwai Center Street Nanchang Jiangxi China 330006
3. Jinggangshan University; Centre for Evidence-Based Medicine; 23 Jifu Road Ji'an Jiangxi China 343000
4. The University of Hong Kong, Queen Mary Hospital; Department of Pediatrics and Adolescent Medicine; Pokfulam Road Hong Kong SAR China