Scardi, Sabino, Bruno Pinamonti, Michele Moretti, and Gianfranco Sinagra. “A Thirty-Nine-Year Survival With the Starr-Edwards Mitral Valve Prosthesis”. Monaldi Archives for Chest Disease 70, no. 1 (January 26, 2016). Accessed June 19, 2021. https://monaldi-archives.org/index.php/macd/article/view/434.