… This systematic review protocol was previously defined and registered at the National Institute
for Health Research … In this systematic review, 77 case control-studies (Supplementary 3 - …

… The protocol for this systematic review was registered on … The PICOS strategy was used
for the research question … A limitation of this systematic review was the lack of studies …

… We followed guidelines by the Cochrane Collaboration for … Register-based studies were
included in this meta-analysis because of … As other research studies have shown, these pre- and …

… This study was conducted in accordance with the Preferred … An a priori protocol was registered
at the PROSPERO database (… We presume that a future research on subfertile patients …

… Findings In this systematic review and meta-analysis of 15 cohort studies with a total of 16
863 … The protocol for this systematic review and meta-analysis is registered with PROSPERO. …

… Systematic Review and Meta-Analyses) statement (Moher, Liberati, Tetzlaff, & Altman, 2009).
The review protocol was registered … , among the studies included in this systematic review, …

… in the PROSPERO international prospective registry of systematic reviews in February 2019
… ), and plastic surgeons in 3.1% (7/222) of cases. Procedures performed varied depending …

… The protocol for this study was registered in the PROSPERO database(CRD42018105291),
an international prospective register of systematic reviews. To perform our search, we used …

… Two main research questions guided the systematic review: (1) … review protocol published
and the review was not registered. … Most studies in this systematic review had relatively high …

… The study process was conducted following the accepted methodology recommendations of
… checklist for systematic reviews and meta-analyses, where registration of the protocol is not …