Das, N KCherian, GSukumar, I PJohn, T J1983-08-012009-05-301983-08-012009-05-301983-08-01Das NK, Cherian G, Sukumar IP, John TJ. Poliovirus and echovirus antibodies in chronic valvular heart disease. Journal of the Association of Physicians of India. 1983 Aug; 31(8): 509-10http://imsear.searo.who.int/handle/123456789/90139engAdolescentAdultAntibodies, Viral --analysisChronic DiseaseEchovirus 9 --immunologyEnterovirus B, Human --immunologyFemaleHumansMaleMiddle AgedMitral Valve Stenosis --immunologyPoliovirus --immunologyJournal Article