Maffessanti F, Marsan NA, Tamborini G, Sugeng L, Caiani EG, Gripari P, Alamanni F, Jeevanandam V, Lang RM, Pepi M. Quantitative analysis of mitral valve apparatus in mitral valve prolapse before and after annuloplasty: a three-dimensional intraoperative transesophageal study. J Am Soc Echocardiogr. 2011 Apr; 24(4):405-13.