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==References==
 
==References==
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* Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''' ''Merial''
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* Nelson, R.W. and Couto, C.G. (2009) '''Small Animal Internal Medicine (Fourth Edition)''' ''Mosby Elsevier''
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* Tilley, L.P. and Smith, F.W.K.(2004)'''The 5-minute Veterinary Consult (Third edition)''' ''Lippincott, Williams & Wilkins''
     
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