1. Using Negative Control Outcomes and Difference-in-Differences Analysis to Estimate Treatment Effects in an Entirely Treated Cohort: The Effect of Ivacaftor in Cystic Fibrosis. Issue 3 (9th November 2021) Authors: Newsome, Simon J; Daniel, Rhian M; Carr, Siobhán B; Bilton, Diana; Keogh, Ruth H Journal: American journal of epidemiology Issue: Volume 191:Issue 3(2022) Page Start: 505 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗