Unravelling the potential of phase portrait in the auscultation of mitral valve dysfunctionM. S. Swapna, S. Sreejyothi, A. Renjini, Vimal Raj and S. SankararamanEur. Phys. J. Plus, 136 2 (2021) 184DOI: https://doi.org/10.1140/epjp/s13360-021-01185-6