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Roth-Isigkeit A, Ocklitz E, Brückner S, Ros A, Dibbelt L, Friedrich HJ, Gehring H, Schmucker P.Roth-Isigkeit A, et al. Among authors: gehring h.Acta Anaesthesiol Scand. 2002 Apr;46(4):415-23. doi: 10.1034/j.1399-6576.2002.460415.x.Acta Anaesthesiol Scand. 2002.PMID: 11952443Clinical Trial.