Enhancing the QUAlity and Transparency Of health Research EQUATOR Network https://www.equator-network.org/
STROBE STrengthening the Reporting of OBservational studies in Epidemiology Checklist for recommendations to the three main analytical designs that are used in observational research: cohort, case-control, and cross-sectional studies.
MOOSE Guidelines for Meta-Analyses and Systematic Reviews of Observational Studies Checklist contains specifications for reporting of meta-analyses of observational studies in epidemiology, including background, search strategy, methods, results, discussion, and conclusion.
RAMESES Realist And Meta-narrative Evidence Syntheses: Evolving Standards Theory-driven, qualitative and mixed-method approaches to systematic review as an alternative to (or to extend and supplement) conventional Cochrane-style reviews.