“…One of them used the OCEBM grading system ( Baunwall et al., 2021 ), and the other guidelines do not mention the grading of evidence ( Crobach et al., 2018 ; Mullane et al., 2019 ; Antonelli et al., 2020 ; Gnocchi et al., 2020 ; Piekarska et al., 2020 ; Xu et al., 2020 ). One of the published guidelines was from Mexico ( Abreu et al., 2019 ), one was from Germany ( Antonelli et al., 2020 ), one was from the Netherlands ( Crobach et al., 2018 ), one was from Italy ( Gnocchi et al., 2020 ), one was from Poland ( Piekarska et al., 2020 ), one was Danish ( Baunwall et al., 2021 ), one was Chinese ( Xu et al., 2020 ), one was developed by international organizations ( Sartelli et al., 2019 ), two were British ( Mullish et al., 2018 ; Lewis et al., 2021 ), and four were American ( Mullane et al., 2019 ; Kelly et al., 2021 ; Poylin et al., 2021 ; Johnson et al., 2021 ). Eight of these guidelines were original versions ( Crobach et al., 2018 ; Mullish et al., 2018 ; Abreu et al., 2019 ; Antonelli et al., 2020 ; Piekarska et al., 2020 ; Xu et al., 2020 ; Baunwall et al., 2021 ; Poylin et al., 2021 ), and six guidelines were updated from the original guidelines ( Mullane et al., 2019 ; Sartelli et al., 2019 ; Gnocchi et al., 2020 ; Kelly et al., 2021 ; Johnson et al., 2021 ; Lewis et al., 2021 ).…”