Lajusticia, Héctor
,
Martínez-Domínguez, Samuel J.
Pérez-Roncero, Gonzalo R.
Chedraui, Peter
Pérez-López, Faustino R. http://orcid.org/0000-0001-5125-4930
Article History
Received: 1 December 2017
Accepted: 5 February 2018
First Online: 14 February 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This systematic review and meta-analysis was performed following the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) statement for meta-analyses. Formal institutional review board approval was not required due to the fact that this analysis consisted of the pooling of published studies.