RT Journal Article SR Electronic T1 Quadricuspid aortic valve: an unusual cause of aortic regurgitation in rheumatoid arthritis JF Heart Asia FD BMJ Publishing Group Ltd, British Cardiovascular Society and Asia Pacific Heart Association SP 98 OP 98 DO 10.1136/heartasia-2013-010349 VO 5 IS 1 A1 Jugal Sharma A1 Aditya Kapoor A1 Sudeep Kumar YR 2013 UL http://heartasia.bmj.com/content/5/1/98.abstract AB