G. Matarese

Upper gastrointestinal endoscopy: are preparatory interventions or conscious sedation effective? A randomized trial.

L. Trevisani, S. Sartori, G. Gilli, 2004, World journal of gastroenterology.

Unsedated ultrathin upper endoscopy is better than conventional endoscopy in routine outpatient gastroenterology practice: a randomized trial.

Sergio Sartori, Lucio Trevisani, Vincenzo Abbasciano, 2007, World journal of gastroenterology.

Cystic pneumatosis of the colon: imaging findings including virtual colonoscopy

S. Sala, S. Bighi, R. Baraldi, 2005 .