Figure 1: Review stages based on PRISMA flow diagram
The results of the search process are summarized into a PRISMA flow
diagram (Figure 1). Out of a total of 909 papers selected, 326
duplicates were removed. After screening the search in PubMed yielded
278, in Web of Science 302, in Cinahl 158 and in the Cochrane Library
159 articles. Through the snowballing method of screening the reference
lists of relevant articles, 12 additional articles complying with the
inclusion criteria could be identified and were added.
After screening 583 papers on title and abstract 63 papers remained for
full-text screening. From these, 36 articles were subjected to quality
assessment.