Sammendrag
Methods We developed a search strategy for a systematic literature search. In November and December 2015, the search was carried out in social and medical scientific databases and in Google and Google Scholar. Two researchers independently screened all identified references to assess inclusion according to predefined criteria. Results • The literature search resulted in 12 833 references after duplicates were removed and 428 read references from BASE, Google and Google Scholar • In total, we identified 132 relevant references - 1 reference was a possible systematic review - 41 references dealt with single instruments - 15 referanser dealt with several instruments - 39 referanser dealt with single models - 18 referanser dealt with several models - 18 referanser dealt with other kinds of studies In this systematic literature search we have not read the publications in full and hence not critically evaluated the studies. We have only sorted the references by type, based on the abstracts.