Protocol of a randomised controlled phase II clinical trial investigating PREoperative endoscopic injection of BOTulinum toxin into the sphincter of Oddi to reduce postoperative pa... by Phillip Knebel, Thilo Hackert, Markus W Büchler, Thomas Bruckner, Peter Sauer, Markus K Diener, Christine Tjaden, Ulla Klaiber, Pascal Probst, Eike Martin, Steffen Luntz

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