Agarwal, A. K., Sharma, D., Baidya, S. G. and Prajapati, D. (2017) “Variability among 2D and 3D methods of calculating mitral valve area: a comparative study with pressure half time method”, Nepalese Heart Journal, 14(2), pp. 13–17. doi: 10.3126/njh.v14i2.18497.