“…In this phase of the selection process 405 records were excluded. The full-texts of the remaining 37 records were assessed for eligibility and 23 records were excluded with the following reasons: 12 records reported an intervention, which was not eligible for inclusion ( Bode et al, 2012 ; Bube, Konge & Hansen, 2017 ; Craven et al, 2018 ; Custers et al, 1999 ; Handley & Handley, 1998 ; Hill et al, 2010 ; Holmes et al, 1998 ; Krautter et al, 2015 ; Liu & Hunt, 2017 ; Velmahos et al, 2004 ; Wirth et al, 2018 ; Yoganathan et al, 2018 ); 8 records used a study design, which was not eligible for inclusion ( Easton, Stratford-Martin & Atherton, 2012 ; Mishra & Dornan, 2003 ; Nikendei et al, 2014 ; Schroder et al, 2017 ; Skrzypek et al, 2018 ; Smith et al, 2019 ; Sopka et al, 2012 ; Tommaso, 2016 ); 2 records were excluded because of missing data ( Archer, Van Hoving & De Villiers, 2015 ; Seymour-Walsh et al, 2015 ) and 1 record did not use the specified primary outcome assessment for procedural skills ( Greif et al, 2010 ). Finally, 14 studies were included into this systematic review.…”