Table 1.

Example guidelines and protocol databases.

Guidelines and protocol databases	Description
Cochrane Collaboration http://www.cochranelibrary.com/	Collection of databases for sharing high quality, independent evidence to inform health decisions.
Collaboration for Environmental Evidence (CEE) http://www.environmentalevidence.org/	Guidelines and standards for evidence synthesis in environmental management.
Campbell Collaboration https://www.campbellcollaboration.org/library.html	Production and use of systematic reviews and evidence synthesis for evidence-based policy and practice.
A code of practice for the conduct of systematic reviews in toxicology and environmental health research (COSTER) https://doi.org/10.5281/zenodo.3539003	Code of practice representing the consensus view of a diverse group of experts as to what constitutes “sound and good” practice in the conduct of environmental health SRs.
Grading of Recommendations, Assessment, Development, and Evaluations (GRADE) https://www.gradeworkinggroup.org/	Systematic approach to rating certainty of evidence in systematic reviews.
Handbook for Conducting a Literature-Based Health Assessment Using Office of Health Assessment and Translation (OHAT) Approach for Systematic Review and Evidence Integration http://ntp.niehs.nih.gov/go/38673	Standard operating procedures for implementing systematic review; OHAT tool for assessing study quality.
Navigation Guide https://ehp.niehs.nih.gov/doi/10.1289/ehp.1307175	Systematic and transparent best practices for research synthesis in environmental health.
Prospero https://www.crd.york.ac.uk/prospero/	International database of prospectively registered systematic reviews for health-related outcomes.
Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) http://www.prisma-statement.org/	Checklist with minimum set of evidence-based items for reporting in systematic reviews and meta-analyses.
RepOrting standards for Systematic Evidence Syntheses (ROSES) https://www.roses-reporting.com/	Reporting standards for preparing systematic reviews, map protocols, and final reports.
SYstematic Review Center for Laboratory animal Experimentation (SYRCLE) https://www.radboudumc.nl/en/research/departments/health-evidence/systematic-review-center-for-laboratory-animal-experimentation	Provides registered protocols for systematic review of animal studies.