Beta-blockers or Placebo for Primary Prophylaxis (BOPPP) of oesophageal varices: study protocol for a randomised controlled trial. - Patel, Vishal C.; McPhail, Mark J.; Uddin, Ruhama; Jafari, Hassan; Lawrence, Vanessa; Boutillier, Clair Le; Shearer, James; Yaziji, Nahel; Cape, Angela; Ahmed, Haroon; Ward, Christopher; Walsh, Peter; et al. (Trials, 2024)