Fig. 1

PRISMA chart illustrating our process of obtaining the 13 included articles. Our initial search produced 396 studies and 1 study was retrieved from alternative sources. Out of this initial pool of studies, 193 remained after duplicates were removed. With 163 irrelevant records excluded based on their titles and abstracts, we reviewed the full texts of 30 articles, of which 17 were excluded and 13 remained for inclusion in our study