Nadeem, Dr. Asif, et al. “A STUDY OF CLINICAL AND ECHOCARDIOGRAPHIC OUTCOMES OF PERCUTANEOUS TRANSVENOUS MITRAL COMMISSUROTOMY FOR MITRAL STENOSIS”. Pakistan Armed Forces Medical Journal, vol. 69, no. Suppl 1, May 2019, pp. S118-22, https://pafmj.org/PAFMJ/article/view/2844.