“…Third, there are positive correlations between downloads and citations, most downloaded articles are those that are more likely to receive citations (O'Leary, 2008;Lippi and Favaloro, 2012). Article download is one of the first alternative metrics to be introduced in digital library (Bollen et al, 2009;Kurtz and Bollen, 2010), while link analysis at article-level is even earlier to be used as altmetrics indicators for research evaluation (Kousha and Thelwall, 2007a,b (Wang et al, 2014(Wang et al, , 2016. The blooming of usage data inspires many studies from various perspectives, i.e., exploring researchers' working habits according to the time of article downloads (Wang et al, 2012), the temporal trends of article downloads after publication (Wang et al, 2014;Duan and Xiong, 2017;Khan and Younas, 2017).…”