The literature review was based on research found in the PubMed, EBSCOhost, Hirsla LSH, and PsychInfo databases. The articles were categorized by content and quality.
Fræðilega saman-tektin byggðist á rannsóknum fengnum úr gagnagrunnunum PubMed, EBSCOhost, Hirsla LSH og Pshycinfo og voru þær flokkaðar eftir innihaldi og gæðum.