%0 Journal Article %T COSMOS-E: Guidance on conducting systematic reviews and meta-analyses of observational studies of etiology %A Andrew G. Renehan %A Douglas G. Altman %A Jan P. Vandenbroucke %A Matthias Egger %A Myriam Cevallos %A Olaf M. Dekkers %J Archive of "PLoS Medicine". %D 2019 %R 10.1371/journal.pmed.1002742 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6383865/