“…Approximately one-third of the studies considered for inclusion
[4,25,26,28,32,33,38,43],
[47,48,50] were published in 2013, while eight
[14,21,27,29,31,34,35,83] and six papers
[15,22,30,40,44,52] were published in 2012 and 2011 respectively. Aside from one paper published in 2005
[49], there were no papers that pre-dated 2007.…”