Materials and Methods
This systematic review based on Preferred Reporting Items for Systematic
Reviews and Meta-Analyses (PRISMA) guidelines. A wide search of
databases including ISI Web of science, PubMed, Scopus and EmBase was
performed from January 2015 to September 2019 Which were published in
English.20 A preliminary search of all of the
mentioned sites revealed 290 studies and in our study, two studies from
Google Scholar were added by expert opinion. Full details of the search
strategy are provided in Supplement 1. Only studies in English were
included.