Table 3.

Geographical distribution of papers retained for analysis.

	Region							Total
	Australia	Canada	USA	Europe	Asia	UK
Publication year	2006	1	0	0	0	0	1	2
	2007	0	0	2	0	0	0	2
	2011	0	0	1	0	0	0	1
	2012	2	0	0	0	0	1	3
	2014	0	0	0	2	0	0	2
	2015	0	0	0	1	0	1	2
	2016	1	0	0	1	0	1	3
	2017	0	0	0	1	0	1	2
	2018	1	1	0	1	0	0	3
	2019	2	0	0	0	0	0	2
	2020	0	0	0	0	1	0	1
Total		7	1	3	6	1	5	23