This study aims to use bibliometric analysis to estimate the global activity within this rapidly developing field and to identify particular areas of focus that are of current relevance to the MGBA during the last decade ( 2009 ) ( 2010 ) ( 2011 ) ( 2012 ) ( 2013 ) ( 2014 ) ( 2015 ) ( 2016 ) ( 2017 ) ( 2018 ).