IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-9-7-30822 Original Research Paper Single versus Bi-leaflet preservation during MVR in chronic rheumatic mitral regurgitation: a single centre retrospective study Neeraj Kumar Dr. Dr Neeraj Prakash Dr. Dr Rakesh Kumar Verma Dr. July 2020 9 7 01 02