Is blood the ideal submucosal cushioning agent? A comparative study in a porcine model - Giday, S A; Magno, P; Buscaglia, J M; Canto, M I; Ko, C -W; Shin, E J; Xia, L; Wroblewski, L M; Clarke, J O; Kalloo, A N; Jagannath, S B; Kantsevoy, S V (Endoscopy, 2006)