**Chief Investigators:**
Richard Martin, University of Bristol
Jenny Donovan, University of Bristol
Freddie Hamdy, University of Oxford
David Neal, University of Oxford
**ISRCTN Registration:**
https://doi.org/10.1186/ISRCTN92187251
**10-year outcomes:**
https://pubmed.ncbi.nlm.nih.gov/29509864/
**Study website:**
https://captrial.blogs.bristol.ac.uk/