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Unkelbach U, Hunfeld A, Breitner-Ruddock S.Unkelbach U, et al. Among authors: breitner ruddock s.Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. 2014 Oct;57(10):1181-4. doi: 10.1007/s00103-014-2035-z.Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. 2014.PMID: 25213735German.