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Knebel, P; Schwan, K; Bruckner, T; Seiler, Cm; Plaschke, K; Streitberger, K; Schaible, A; Bopp, C (2011). Double-blinded, randomized controlled trial comparing real versus placebo acupuncture to improve tolerance of diagnostic esophagogastroduodenoscopy without sedation: a study protocol. Trials, 12, p. 52. London: BioMed Central 10.1186/1745-6215-12-52
