1. Bogunovic N, Horstkotte D, Scholtz W, Faber L, Bogunovic L, van Buuren F (2014) A differentiated morphological parameter-coding system to describe the suitability of mitral valve stenoses intended for percutaneous valvotomy. Heart Vessels. doi: 10.1007/s00380-014-0536-1
2. Hamatani Y, Saito N, Tazaki J, Natsuaki M, Nakai K, Makiyama T, Sasaki Y, Imai M, Watanabe S, Shioi T, Kimura T, Inoue K (2013) Percutaneous balloon valvuloplasty for bioprosthetic mitral valve stenosis. Heart Vessels 28:667–671
3. Duggal B, Bajaj M, Prabhu S, Mathew T (2012) The mitral leaflet separation index for assessment of mitral stenosis during percutaneous mitral commissurotomy: validation of the index in the immediate post-MC period. Echocardiography 29:1143–1148
4. Horstkotte D, Lengyel M, Mistiaen WP, Piper C, Völler H (2005) Working group infection, thrombosis, embolism and bleeding’ of the society of heart valve disease. Recommendations for reporting morbid events after heart valve surgery. J Heart Valve Dis 14:1–7
5. Zoghbi WA, Chambers JB, Dumesnil JG, Foster E, Gottdiener JS, Grayburn PA, Khandheria BK, Levine RA, Marx GR, Miller FA Jr, Nakatani S, Quiñones MA, Rakowski H, Rodriguez LL, Swaminathan M, Waggoner AD, Weissman NJ, Zabalgoitia M (2009) Recommendations for evaluation of prosthetic valves with echocardiography and Doppler ultrasound. J Am Soc Echocardiogr 22:975–1014