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John U, Meyer C, Ulbricht S, Schumann A, Freyer-Adam J, Hapke U, Rumpf HJ, Bischof G, Grothues J, Thyrian JR.John U, et al.Med Klin (Munich). 2007 Jan 15;102(1):33-6. doi: 10.1007/s00063-007-1006-7.Med Klin (Munich). 2007.PMID: 17221350German.