TY - JOUR T1 - Standing Valsalva maneuver in idiopathic hypertrophic subaortic stenosis JF - Canadian Medical Association Journal JO - CMAJ SP - 683 LP - 684 VL - 118 IS - 6 AU - D. L. Levene AU - S. Z. Naqvi AU - S. J. Shane Y1 - 1978/03/18 UR - http://www.cmaj.ca/content/118/6/683.abstract ER -