Table 1.

Overview of included studies (n = 40)

Years of publication	Country of origin	Study design
2007–2020	North America = 17 Europe and UK = 12 Asia = 5 Middle East = 3 Australia = 3 Africa = 0 South America = 0	Systematic reviews and meta-analyses = 5 Reviews with systematic search methods = 2 Cross-sectional studies, with population/registry samples = 20 Cross-sectional studies, with clinic/community samples = 13