Specialist valve clinics: recommendations from the British Heart Valve Society working group on improving quality in the delivery of care for patients with heart valve disease. Issue 23 (26th March 2013) - Chambers, John B; Ray, Simon; Prendergast, Bernard; Taggart, David; Westaby, Stephen; Grothier, Lucy; Arden, Chris; Wilson, Jo; Campbell, Brian; Sandoe, Jonathan; Gohlke-Bärwolf, Christa; Mestres, Carlos-A; et al.