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Mitral valve billowing and prolapse: perspective at 25 years. Herz 1988; 13: 227-34."},{"key":"2","doi-asserted-by":"crossref","unstructured":"2) Carpentier A, Chauvaud S, Fabiani JN, et al. Reconstructive surgery of mitral valve incompetence: ten-year appraisal. J Thorac Cardiovasc Surg 1980; 79: 338-48.","DOI":"10.1016\/S0022-5223(19)37942-5"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3) Fornes P, Heudes D, Fuzellier JF, et al. Correlation between clinical and histologic patterns of degenerative mitral valve insufficiency: a histomorphometric study of 130 excised segments. Cardiovasc Pathol 1999; 8: 81-92.","DOI":"10.1016\/S1054-8807(98)00021-0"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4) Matsukuma S, Eishi K, Yamachika S, et al. Risk factors of posterior pericardial annuloplasty for isolated posterior leaflet prolapse. 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