en: Peer-reviewed references were used in writing this dissertation and data was collected through the databases PubMed, Cinahl, ProQuest, ScienceDirect and the website of World Health Organization.
is: Öflun gagna fór fram í gegnum gagnasöfn PubMed, Cinahl, ProQuest, ScienceDirect og vef Alþjóðaheilbrigðismálastofnunarinnar.