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Käser SA, Froelicher J, Li Q, Müller S, Metzger U, Castiglione M, Laffer UT, Maurer CA.Käser SA, et al. Among authors: laffer ut.Langenbecks Arch Surg. 2015 Aug;400(6):675-82. doi: 10.1007/s00423-014-1243-1. Epub 2014 Aug 28.Langenbecks Arch Surg. 2015.PMID: 25163656Clinical Trial.
Metzger U, Laffer U, Aeberhard P, Arigoni M, Arma S, Barras J, Egeli R, Martinoli S, Mueller W, Schweizer W.Metzger U, et al.Acta Chir Scand. 1990 Jun-Jul;156(6-7):467-74.Acta Chir Scand. 1990.PMID: 2114722Clinical Trial.