Sentence examples for articles were searched to from inspiring English sources

Electronic bibliographic databases, key journals and reference lists of reviews and articles were searched to identify studies for inclusion.

References of all articles were searched to identify further articles.

Reference lists of the selected articles were searched to retrieve further relevant articles.

Reference lists of selected articles were searched to identify additional relevant papers.

The related reference articles were searched to identify other relevant publications.

The reference sections of all retrieved articles were searched to identify further relevant articles.

Online databases and article bibliographies were searched to produce relevant randomized-controlled trials published during the past 5 years.

Reference lists of background articles and eligible studies were searched to identify additional studies.

Reference lists in the articles included in the review were searched to identify further eligible articles.

References from relevant articles, letters, reviews and editorials were searched to identify any additional relevant studies.

In addition, the reference lists in these articles were searched manually to find other relevant publications.