A patient-centred model to quality assure outputs from an echocardiography department: consensus guidance from the British Society of Echocardiography oleh Thomas E Ingram, Steph Baker, Jane Allen, Sarah Ritzmann, Nina Bual, Laura Duffy, Chris Ellis, Karina Bunting, Noel Black, Marcus Peck, Sandeep S Hothi, Vishal Sharma, Keith Pearce, Richard P Steeds, Navroz Masani