EFSUMB Recommendations for Gastrointestinal Ultrasound Part 3: Endorectal, Endoanal and Perineal Ultrasound oleh Dieter Nuernberg, Adrian Saftoiu, Ana Paula Barreiros, Eike Burmester, Elena Tatiana Ivan, Dirk-André Clevert, Christoph F. Dietrich, Odd Helge Gilja, Torben Lorentzen, Giovanni Maconi, Ismail Mihmanli, Christian Pallson Nolsoe, Frank Pfeffer, Søren Rafael Rafaelsen, Zeno Sparchez, Peter Vilmann, Jo Erling Riise Waage