RT Journal A1 Foust R T1 MItral valve prolapse JF JAMA JO JAMA YR 2013 FD January 2 VO 309 IS 1 SP 12 OP 12 DO 10.1001/jama.2012.13650 UL http://dx.doi.org/10.1001/jama.2012.13650 AB