The morphine–prostigmine provocation (Nardi) test for sphincter of Oddi dysfunction: results in healthy volunteers and in patients before and after transduodenal sphincteroplasty and transampullary septectomy. Issue 10 (13th September 2007) - Lobo, D N; Takhar, A S; Thaper, A; Dube, M G; Rowlands, B J