SS citation network. Network results for the SS search separated by decades 1980–2019, n = 28 248 total records with more than 10 citations, largest 7–10 communities are colour coded. The total number of nodes (edges) per decade: 1980s = 392 (268), 1990s = 2727 (7995), 2000s = 8959 (55 700), and 2010s = 16 170 (143 879). Abbreviations: CTE = chronic traumatic encephalopathy; TBI = traumatic brain injury; DTI = diffusion tensor imaging. NOTE: in order to visualize networks, some papers that were extreme outliers (represented as a great spatial distance from a module) are not depicted in the current renderings.