RT Journal Article SR Electronic T1 Updates on Valvular Heart Disease JF MD Conference Express YR 2005 FD SAGE Publications VO 5 IS 1 SP 10 OP 12 DO 10.1177/155989770501002 UL http://mdc.sagepub.com/content/5/1/10.abstract AB Aortic regurgitation (AR) suffers from sparse data, according to Jeffrey S. Boyer, MD, of the Weill Medical College of Cornell University in New York, NY. “AR has been studied less than any other form of valvular heart disease,” he said.