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Hofmann-Kiefer KF, Chappell D, Jacob M, Schülke A, Conzen P, Rehm M.Hofmann-Kiefer KF, et al. Among authors: schulke a.Anaesthesist. 2009 Dec;58(12):1210-5. doi: 10.1007/s00101-009-1640-y.Anaesthesist. 2009.PMID: 19911108German.