Table 2.

Study characteristics

Overall cohort
Study	Location	Design	Study period	Size (n)		Mean age (years)	Male (%)
Moore et al. 2016	USA	Retrospective cohort	2012–2015		62	47	51 (82%)
Pedersen et al. 2020	Denmark	Prospective cohort	2016–2019		33	48	31 (94%)
Giger et al. 2009	Switzerland	Retrospective cohort	1997–2007		32	47	28 (88%)
Bjurstrom et al. 2016	USA	Prospective cohort	2014–2015		10	47	9 (90%)
Muto et al. 2005	Italy	Retrospective cohort	2002–2005		5	NA	5 (100%)