Answer
Get MOOSE guidelines from this JAMA article:
What is MOOSE?
MOOSE is a reporting guideline from Meta-Analysis of Observational Studies in Epidemiology. MOOSE improves the reporting meta-analysis of observational studies.
MOOSE was proposed in the 2000 JAMA article titled "Meta-analysis of Observational Studies in Epidemiology: A Proposal for Reporting."