Table 1.

Geographic representation of included studies

	N	% of included studies across and within subregions	Countries represented (and number of studies within that country)	References
Africa	11	11%
Northern Africa	1	9%	Egypt (1)	[115]
Eastern Africa	2	18%	Kenya (2)	[107, 132]
Middle Africa	0	0%	–	–
Southern Africa	2	18%	South Africa (2)	[47, 122]
Western Africa	6	55%	Nigeria (3), Mali (1), Ghana (2)	[43, 76, 87, 94, 102, 104]
Americas	32	32%
Latin America and the Caribbean	10	31%	Dominican Republic (1), Mexico (3), Brazil (6)	[44, 57, 68, 78, 81, 84, 95, 103, 124, 137]
Northern America	22	69%	US (18), Canada (3), Unspecified (1)	[46, 58, 59, 61, 62, 71, 75, 85, 86, 90–92, 111, 112, 125–127, 130, 133–136]
Antarctica	0	na	–	–
Asia	7	7%
Central Asia	0	0%	–	–
Eastern Asia	1	14%	China (1)	[64]
Southeastern Asia	1	14%	Thailand (1)	[114]
Southern Asia	3	43%	India (1), Bangladesh (1), Iran (1)	[63, 83, 99]
Western Asia	2	29%	Turkey (2)	[45, 123]
Europe	20	20%
Eastern Europe	0	0%	–	–
Northern Europe	10	50%	Finland (1), Ireland (1), Netherlands (1), UK (7)	[51, 52, 82, 97, 98, 100, 105, 109, 113, 145]
Southern Europe	6	30%	Italy (3), Spain (3)	[66, 67, 77, 79, 88, 138]
Western Europe	4	20%	Austria (2), Germany (1), Switzerland (1)	[48, 53, 60, 110]
Oceania	6	6%
Australia and New Zealand	6	100%	Australia (5), New Zealand (1)	[54, 96, 106, 121, 139, 141]
Melanesia, Micronesia, Polynesia	0	0%		–
Multi-country studies or systematic reviews	24	24%	Australia, Austria, Belgium, Brazil, Canada, Chile, China, Czech Republic, Dominican Republic, Finland, France, Germany, Hungary, Indonesia, Israel, Italy, Japan, Kenya, Netherlands, New Zealand, Nigeria, Norway, Poland, Russia, Scotland, Slovakia, South Africa, Spain, Sweden, Switzerland, Thailand, Tunisia, Turkey, Ukraine, UK, US, Zimbabwe; unspecified countries in Europe, Asia, and Western Europe; countries included in studies in systematic reviews	[49, 50, 55, 56, 65, 69, 70, 72–74, 80, 89, 93, 101, 108, 116–120, 128, 131, 140, 160]