RT Journal Article SR Electronic T1 The PRISMA 2020 statement: an updated guideline for reporting systematic reviews JF BMJ JO BMJ FD British Medical Journal Publishing Group SP n71 DO 10.1136/bmj.n71 VO 372 A1 Page, Matthew J A1 McKenzie, Joanne E A1 Bossuyt, Patrick M A1 Boutron, Isabelle A1 Hoffmann, Tammy C A1 Mulrow, Cynthia D A1 Shamseer, Larissa A1 Tetzlaff, Jennifer M A1 Akl, Elie A A1 Brennan, Sue E A1 Chou, Roger A1 Glanville, Julie A1 Grimshaw, Jeremy M A1 Hróbjartsson, Asbjørn A1 Lalu, Manoj M A1 Li, Tianjing A1 Loder, Elizabeth W A1 Mayo-Wilson, Evan A1 McDonald, Steve A1 McGuinness, Luke A A1 Stewart, Lesley A A1 Thomas, James A1 Tricco, Andrea C A1 Welch, Vivian A A1 Whiting, Penny A1 Moher, David YR 2021 UL https://www.bmj.com/content/372/bmj.n71.abstract AB