Ginestal-Cruz, A, N Grima, A P Correia, V Duarte, and J P Correia. 1990. “Endoscopic Sphincterotomy in Choledocholithiasis: Analysis of an Experience of 530 Interventions”. Acta Médica Portuguesa 3 (3). Lisbon, Portugal:133-40. https://doi.org/10.20344/amp.4563.