Ballas, P.
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Univ Vet Med Vienna, Dept Farm Anim & Vet Publ Hlth, Univ Clin Ruminants, Clin Unit Herd Hlth Management Ruminants, Vienna, Austria
Univ Vet Med Vienna, Inst Microbiol, Dept Pathobiol, Funct Microbiol, Vienna, Austria Univ Vet Med Vienna, Dept Farm Anim & Vet Publ Hlth, Univ Clin Ruminants, Clin Unit Herd Hlth Management Ruminants, Vienna, Austria