RT Journal Article SR Electronic T1 Long term mortality and cardiovascular morbidity increased in some patients with asymptomatic mitral valve prolapse JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 91 OP 91 DO 10.1136/ebm.8.3.91 VO 8 IS 3 YR 2003 UL http://ebm.bmj.com/content/8/3/91.abstract AB