Fig. 1: Flow diagram of the study selection process.

A total of 1314 publications were retrieved by searching all databases. Of these, 351 duplicates were removed. Screening titles and abstracts of the remaining publications led to excluding 634 citations. By reading the full text of the remaining 329 publications, we excluded 280 publications. Five additional publications were identified by checking the list of the included reviews. In total, 54 publications were included in the current review.