1 School of Public Health, Lanzhou University, Lanzhou, China.
2 Institute of Global Health, University of Geneva, 1202 Geneva, Institute of Mathematical Statistics and Actuarial Science, University of Bern, Bern, Switzerland.
3 Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada.
4 Department of Respiratory Medicine, Children's Hospital of Chongqing Medical University, Chongqing, China; National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China; Chongqing Key Laboratory of Pediatrics, Chongqing, China.
5 School of Public Health, Lanzhou University, Lanzhou, China; Evidence-based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China; WHO Collaborating Centre for Guideline Implementation and Knowledge Translation, Lanzhou, China; Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province, Lanzhou University, Lanzhou, China. Electronic address: firstname.lastname@example.org.