Funding for this research was provided by:
Nutrition and Food Security research center, Shahid Sadoughi University of Medical Sciences
Received: 9 February 2019
Accepted: 7 April 2020
First Online: 22 April 2020
: There is no conflict of interest to report for this study.
: We followed the Meta-Analysis of Observational Studies in Epidemiology (MOOSE) checklist and Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) for reporting the current meta-analysis. The protocol is also registered in the international prospective register of systematic reviews (PROSPERO) database (ExternalRef removed, with registration ID of CRD 42018086500).
: No individual detail is presented in this manuscript; therefore it is not applicable.