Ashfaq, M. et al. 2021. EARLY MORTALITY & MORBIDITY IN MITRAL VALVE REPLACEMENT WITH TOTAL SUB-VALVULAR APPARATUS PRESERVATION, PARTIAL PRESERVATION AND NO PRESERVATION - A COMPARATIVE STUDY. Pakistan Armed Forces Medical Journal. 70, Suppl-4 (Jan. 2021), S715–20. DOI:https://doi.org/10.51253/pafmj.v70iSuppl-4.6006.