Table 1.

The result of testing the keywords for our article search.

Database	Search fields	Result with no constraints, n	Constraints	Result with constraints, n
Scopus	Title, abstract, and keywords	822	English, published in 2008 or after, and article	358
Web of Science	Topic	681	English, published in 2008 or after, and article	470
PubMed	MeSHa fields	4627	English, published in 2008 or after, article, clinical trial, and human subjects	1502
ACMb	All fields	10	English, published in 2008 or after, and article	7
Totalc	All fields	6140	All constraints	2337

^aMeSH: Medical Subject Headings.

^bACM: Association for Computing Machinery.

^cThese results were affected by searching the libraries without constraints and yielded unrelated results.