Patient position during ERCP: prone versus supine. What about left lateral throughout?

References

• 1 Terruzzi V, Radaelli F, Meucci G, Minoli G. Is the supine position as safe and effective as the prone position for endoscopic retrograde cholangiopancreatography? A prospective randomized study.  Endoscopy. 2005;  37 1211-1214
• 2 Warner M A. Patient positioning. In: Barash PG, Cullen BF, Stoelting RK, editors Clinical anesthesia, 5th ed. Philadelphia; Lippincott Williams and Wilkins 2006: 643-667