SPINA, G. P ., and M. PAGANI. “PROPHYLACTIC CHOLECYSTECTOMY FOR SILENT GALLSTONE DISEASE”. Annali Italiani Di Chirurgia, vol. 69, no. 6, Nov. 1998, pp. 713-8, https://annaliitalianidichirurgia.it/index.php/aic/article/view/3182.