Table 2.

Summary of key characteristics of the included publications (N=76).

Classification		Papers, n (%)
Country of corresponding author
	United States	55 (72.4)
	United Kingdom	9 (11.8)
	Canada	2 (7.6)
	France	2 (2.6)
	Germany	2 (2.6)
	The Netherlands	2 (2.6)
	Other	4 (5.3)
Country income classification
	High	75 (98.7)
	Middle	1 (1.3)
	Low	0
Study methods
	Quantitative methods	42 (55.3)
	Qualitative methods	27 (35.5)
	Mixed methods	7 (9.2)
Study data type
	Primary data	46 (60.5)
	Secondary data	23 (30.3)
	Both primary and secondary data	7 (9.2)