AMSTAR 2 overall confidence rating: lacking discriminating capacity or requirement of high methodological quality?

Affiliations

• ¹ Federal Joint Committee (Healthcare), Medical Consultancy Department, Gutenbergstr. 13, Berlin 10587, Germany; Division of Social and Preventive Medicine, University of Potsdam, Research Focus Cognitive Sciences, Am Neuen Palais 10, Potsdam 14469, Germany. Electronic address: robert.ca.lorenz@gmail.com.
• ² Federal Joint Committee (Healthcare), Medical Consultancy Department, Gutenbergstr. 13, Berlin 10587, Germany.
• ³ IFOM - Institute for Research in Operative Medicine, School of Health, Witten/Herdecke University, Ostmerheimer Street 200, 51109 Cologne, Germany.
• ⁴ Federal Institute for Occupational Safety and Health, Nöldnerstr.40-42, 10317 Berlin, Germany.