De Toma, G., et al. “REFLECTIONS ABOUT MALIGNANT PHEOCHROMOCYTOMA: PERSONAL EXPERIENCE, LITTERARY REVIEW”. Annali Italiani Di Chirurgia, vol. 73, no. 4, July 2002, pp. 413-9, https://annaliitalianidichirurgia.it/index.php/aic/article/view/575.