Table 1. Topological characteristics of KCNs for nanoEHS literature for three time windows: 2005–2007, 2008–2010, and 2011–2013.

	2005–2007	2008–2010	2011–2013
Number of Articles	59	215	349
Nodes	208	565	912
Links	1049	2438	3252
Average Strength <s>	10.47	9.44	7.48
Max Strength	100	247	292
Average Degree <k>	10.09	8.63	7.13
Max Degree	79	173	239
Average Weight <w>	1.04	1.09	1.05
Max Weight	6	18	18