Bozzi, Rosamaria, Vincenzo Di Martino, Antonio Inzirillo, Eugenio D’Avenia, Maurizio Inzirillo, Fabio Cattaneo, and Domenico Cattaneo. 2013. “Pneumatic Dilation and Botulinum Toxin: When and Why?”. Annali Italiani Di Chirurgia 84 (5):501-4. https://annaliitalianidichirurgia.it/index.php/aic/article/view/862.