 | Up a level |
Dekkers, Olaf M; Vandenbroucke, Jan P; Cevallos, Myriam; Renehan, Andrew G; Altman, Douglas G; Egger, Matthias (2019). COSMOS-E: Guidance on conducting systematic reviews and meta-analyses of observational studies of etiology. PLoS medicine, 16(2), e1002742. Public Library of Science 10.1371/journal.pmed.1002742
