A literature review was conducted and a search of the most current literature was carried out using internationally recognized databases such as PubMed, Scopus and Cinahl published from 2007 until 2017.
Gerð var fræðileg samantekt en leitað var í gagnagrunnum PubMed, Scopus og Cinahl af ritrýndum fræðigreinum frá árunum 2007-2017.