British randomised controlled trial of AV and VV optimization ("BRAVO") study: rationale, design, and endpoints - Whinnett,ZI; Sohaib,SMA; Jones,S; Kyriacou,A; March,K; Coady,E; Mayet,J; Hughes,AD; Frenneaux,M; Francis,DP (BMC CARDIOVASCULAR DISORDERS, 2014)