Fig. 4

Word clouds visualizing the frequency of words used in SCMR scientific session titles over the past 20 years. Session titles were grouped in 5-year intervals and represent most frequently used words in SCMR session titles from 1998 to 2002 (a), 2003–2007 (b), 2008–2012 (c), and 2013–2017 (d). Word clouds were created using Voyant Tools (http://voyant-tools.org/)