Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13750-020-00215-7/MediaObjects/13750_2020_215_Fig2_HTML.png)
Flow diagram adapted from ROSES [48] showing literature sources and inclusion/exclusion process. Note that duplicate removal after searches was not fully successful and some duplicates were removed only after title/abstract screening. Excluded articles include also duplicates but the exact number cannot be reported as automatic duplicate removal did not function as desired in the software used