“…Despite the institutional environment, social factors that influence scientific collaboration are growingly emphasized, such as personal differences (Birnholtz, 2007), linguistic or cultural divides (Freeman & Huang, 2015), and academic rank or institutional barriers (Jones, Wuchty, & Uzzi, 2008;Li, Li, Liu, & Liu, 2018;Thijs & Glänzel, 2010) (see Hall et al, 2018, for a detailed review). It is worth noting that institutions are stratified and are not weighted equally in the scientific collaboration network (Chang & Huang, 2013); thus, choosing whom to collaborate with is far from a random selection and would profoundly determine the different performances of scientific collaboration.…”