Literature review and recommendations for clinical application of small-bowel capsule endoscopy, based on a panel discussion by international experts - Mergener, K; Ponchon, T; Gralnek, I; Pennazio, M; Gay, G; Selby, W; Seidman, E G; Cellier, C; Murray, J; de Franchis, R; Rösch, T; Lewis, B S (Endoscopy, 2007)