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Keller J, Wieland B, Wittwer M, Stephan R, Perreten V.Keller J, et al. Among authors: stephan r.Zoonoses Public Health. 2007;54(1):2-7. doi: 10.1111/j.1863-2378.2007.00981.x.Zoonoses Public Health. 2007.PMID: 17359440
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Cernela N, Nüesch-Inderbinen M, Hächler H, Stephan R.Cernela N, et al. Among authors: stephan r.Epidemiol Infect. 2014 Jan;142(1):84-9. doi: 10.1017/S095026881300054X. Epub 2013 Apr 16.Epidemiol Infect. 2014.PMID: 23591052Free PMC article.