“…The total number of participants in these intervention studies ranged from 12 (Chyung, 2001) to 255878 (Martorell & McFarlin, 2011). Six of the interventions investigated were (at least partly) online interventions (Bettinger & Baker, 2014;Chyung, 2001;Huett et al, 2008;Inkelaar & Simpson, 2015;Ruthig, Perry, Hall, & Hladkyj, 2004;Simpson, 2008). Interventions lasted from a minimum of one informal session (Ruthig et al, 2004) until one year (Arnold, 2015;Bettinger & Baker, 2014;Larose et al, 2011;Salinitri, 2005; Sneyers & De Witte, 2017; Stegers-Jager, Cohen-Schotanus, Splinter, & Themmen, 2011), though not all intervention studies gave details regarding the duration of the intervention.…”