Methodological quality of Campbell Systematic Reviews has improved over the past decade

Affiliations

• ¹ School of Basic Medical Sciences, Evidence Based Medicine Center Lanzhou University Lanzhou China.
• ² Bruyère Research Institute University of Ottawa Ottawa Canada.
• ³ University of Ottawa Heart Institute University of Ottawa Ottawa Canada.
• ⁴ Evidence Based Social Science Research Center/Health Technology Assessment Center, School of Public Health Lanzhou University Lanzhou China.
• ⁵ School of Health Sciences Carleton University Ottawa Canada.
• ⁶ University of Toledo College of Medicine and Life Sciences Toledo Ohio USA.