G. Gutiérrez-Ballesteros, D. Mesa-Rubio, M. Martín-Hidalgo, J. Fernández-Cabeza, and C. Aristizábal-Duque, “Mitral insufficiency of unusual etiology”, Rev Ecocardiogr Pract Otras Tec Imag Card (RETIC), no. 5, pp. 41–44, Aug. 2017.