Endoscopic retrograde cholangiopancreatography, but not esophagogastroduodenoscopy or colonoscopy, significantly increases portal venous pressure: direct portal pressure measurements through endoscopic ultrasound-guided cannulation - Buscaglia, J. M.; Shin, E. J.; Clarke, J. O.; Giday, S. A.; Ko, C. W.; Thuluvath, P. J.; Magno, P.; Dray, X.; Kantsevoy, S. V. (Endoscopy, 2008)