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2. 1969. Absence of opening click in dehiscence of mitralvalve prosthesis;Leachman, R.D.; Cokkinos, D.V.P.;New England Journal of Medicine
3. Ventriculo-atrial regurgitation following prosthetic replacement of the mitral valve. Angiocardiographic and hemodynamic findings;Rockoff, S.D.; Ross, Jr., J.; Oldham, Jr., N.N.; Mason, D.T.; Morrow, A.G.; Braunwald, E.;American Journal of Cardiology,1966