“…Few studies, mostly recently (e.g. Hasan et al, 2020;Koster et al, 2019;Liberati et al, 2016;Ramírez-Alesón & Fernández-Olmos, 2018;Siegel et al, 2003a;Squicciarini, 2008;Ubeda et al, 2019;Vásquez-Urriago et al, 2014, 2016aXue & Zhao, 2021;Yang, Hsu, et al, 2009;Yang, Motohashi, et al, 2009), apply econometric methods to address the selection bias problem.…”