Methods
A protocol including study selection criteria and data extraction
methods was developed. The systematic review was registered with the
International Prospective Register of Systematic Reviews (PROSPERO)
(registration number: CRD42019133104; Available from:
https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42019133104;
Registered on 04 September 2019), and was conducted in accordance with
the Preferred Reporting Items for Systematic Reviews and Meta-Analyses
(PRISMA) statement 13. Ethical approval was not
required for this study. This study did not require any funding.