Gul, A. M., T. Nawaz, and M. S. Jibran. “TWENTY YEARS EXPERIENCE OF SUCCESSFUL PERCUTANEOUS TRANSMITRAL COMMISUROTOMY PERFORMED THROUGH PATENT FORAMEN OVALE”. Pakistan Heart Journal, vol. 50, no. 4, Mar. 2018, doi:10.47144/phj.v50i4.1360.