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Wacker F, Branding G, Wagner A, Ewert A, Faiss S, Wendt M, Wolf KJ.Wacker F, et al. Among authors: wolf kj.Rofo. 1998 Dec;169(6):649-54. doi: 10.1055/s-2007-1015357.Rofo. 1998.PMID: 9930221German.
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Faiss S, Zeitz M, Wolf KJ, Lewin JS, Wacker FK.Faiss S, et al. Among authors: wolf kj.Endoscopy. 2003 Jan;35(1):89-91. doi: 10.1055/s-2003-36416.Endoscopy. 2003.PMID: 12510234
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Wacker F, Schilling A, Dihlmann SW, Zellner A, König H, Wolf KJ.Wacker F, et al. Among authors: wolf kj.Rofo. 1995 Jan;162(1):51-7. doi: 10.1055/s-2007-1015834.Rofo. 1995.PMID: 7841402German.