Table 1.

Search results and website selection.

Screening procedure		Search engine
		Google, n (%)	Baidu, n (%)	Yahoo, n (%)	Bing, n (%)
Initial search results (n=202)		56 (28)	39 (19)	58 (29)	49 (24)
Unique sites after duplicates (n=57)		23 (40)	15 (26)	6 (11)	13 (23)
Eligibility criteria not met
	Journal papers (n=8)	3 (37)	5 (63)	—a	—
	Book chapters (n=4)	2 (50)	—	1 (25)	1 (25)
	Patent applications (n=3)	—	3 (100)	—	—
	Included websites (n=42)	18 (43)	7 (17)	5 (12)	12 (28)

^aNot available.