These draft timelines list key events in the history of the interventions of interest to the Review. They draw on evidence that the Review has received in writing, in the oral hearings, in meeting with the patient groups, and our own research. While we are not seeking feedback on these documents, should anyone submit comments including factual corrections we will of course give them due consideration. Any such comments must be received by the Review no later than Friday 13th March 2020. Final versions will be published at the same time as the Review’s report.