S. Hussain, Fateh Ali Tipoo Sultan, Mariam Naz, Sumyia Gurmani, and Shazia Rasheed, “Mitral leaflet separation index correlation with mitral stenosis severity, a reliable easy 2-d echocardiography technique”, J Pak Med Assoc, vol. 74, no. 2, pp. 243–246, Jan. 2024.