1. OP87 Dagitty and directed acyclic graphs in observational research: a critical review. (2nd September 2017) Authors: Tennant, PWG; Textor, J; Gilthorpe, MS; Ellison, GTH Journal: Journal of epidemiology and community health Issue: Volume 71(2017)Supplement 1 Page Start: A43 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗