<style face="normal" font="default" size="100%">Case-control study on chronic diseases in dairy herds in northern Germany: Symptoms at the herd level</style>

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0<style face="normal" font="default" size="100%">Case-control study on chronic diseases in dairy herds in northern Germany: Symptoms at the herd level</style><style face="normal" font="default" size="100%">Case-control study on chronic diseases in dairy herds in northern Germany: Symptoms at the herd level</style>