“…Of the 21 studies, five studies were prospective observational ( Mereu et al, 2018 , Mereu et al, 2020 , Buda et al, 2016 , Hagen et al, 2016 , Geppert et al, 2018 ), one was using a historical control ( Liu et al, 2017 ), eleven were retrospective observational studies ( Accorsi et al, 2020 , Casarin et al, 2020 , Stewart et al, 2020 , Leitao et al, 2020 , Uccella et al, 2018 , Moukarzel et al, 2017 , St Clair et al, 2016 , Goebel et al, 2020 , Peiretti et al, 2019 , Buda et al, 2017 , Imboden et al, 2019 ), three were retrospective database reviews, ( Wright et al, 2017 , Polan et al, 2019 , Gomez-Hidalgo et al, 2018 ) and one used a decision analysis model ( Suidan et al, 2018 ). There were no prospective randomized trials.…”