The designations and denominations employed and the presentation of the material in this article do not imply the expressionof any opinion whatsoever on the part of the OIE concerning the legal status of any country, territory, city or area or of its authorities,or concerning the delimitation of its frontiers and boundaries.The views expressed in this article are solely the responsibility of the author(s). The mention of specific companies or productsof manufacturers, whether or not these have been patented, does not imply that these have been endorsed or recommended by theOIE in preference to others of a similar nature that are not mentioned.
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