Table 1.

Characteristics of all articles included in the review

Characteristic of the publication	Number of publications (%)	Publication reference list
Year of publication
1990–1999	5/47	[39, 42, 47, 73, 74]
2000–2009	19/47
2010–2016	23/47	[37, 44, 46, 49–54, 58, 61, 63, 66, 65–67, 69, 71, 79–84] [41, 42, 44, 45, 48, 51, 56, 60, 71, 73]
Location of the study
Africa	2/47	[60, 71]
Australia	4/47	[43, 52, 56, 58]
East Asia	3/47	[37, 46, 77]
Europe	9/47	[38, 45, 47, 57, 73, 75, 76, 81, 82]
Latin America	1/47	[79]
Middle East	2/47	[40, 59]
North America	18/47	[39, 42, 48–51, 54, 55, 63, 64, 66–68, 70, 74, 78, 80, 83]
South Asia	1/47	[62]
Multiple locations (systematic reviews)	7/47	[8, 41, 44, 53, 61, 65, 69]
Sample Size
< 30	4/47	[47, 66–68]
30–99	9/47	[39, 43, 58, 59, 74, 78–80, 82]
100–499	14/47	[37, 38, 40, 46, 49, 57, 62–64, 70, 75, 77, 81, 83]
500–999	3/47	[46, 64, 80]
1000–4999	11/47	[41, 42, 44, 45, 48, 51, 56, 60, 65, 71, 73]
> 5000	6/47	[53–55, 61, 69, 84]