“…The classification was performed by the two authors by following a consensual approach. (Belz, 2006;Torres et al, 2009;Williams et al, 2011;Keinonen, 2010;Lockton et al, 2012;Kim and Christiaans, 2012;van der Bijl-Brouwer and van der Voort, 2014;Hoyos-Ruiz et al, 2017) (Nyber and Kempic, 2006;Johnston et al, 2008;Nam et al, 2009;Yeh et al, 2010;Crilly, 2011;Wilkinson and De Angeli, 2014;Cor and Zwolinski, 2015;Cruz Mendoza et al, 2015;Wu and Smith, 2015;Wu and Pillan, 2017) (Ingram, 1984;Chamorro-Koc et al, 2008;Johnston et al, 2008;Kim and Christiaans, 2012;van der Bijl-Brouwer and van der Voort, 2014;Normark and Gustafsson, 2014;Hoyos-Ruiz et al, 2017) (Ludden and Rompay , 2015)…”