RT Journal Article SR Electronic T1 Changing epidemiology and natural history of valvular heart disease JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 168 OP 171 DO 10.7861/clinmedicine.10-2-168 VO 10 IS 2 A2 Bernard Prendergast A2 Philip MacCarthy A1 Simon Ray YR 2010 UL http://www.rcpjournals.org/content/10/2/168.abstract