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The information in the various pages of the WHO web site is issued by the World Health Organization for general distribution. The information presented is protected under the Berne Convention for the Protection of Literature and Artistic works, under other international conventions and under national laws on copyright and neighbouring rights. Extracts of the information in the web site may be reviewed, reproduced or translated for research or private study but not for sale or for use in conjunction with commercial purposes.

Any use of information in the web site should be accompanied by an acknowledgment of WHO as the source, citing the uniform resource locator (URL) of the article. Reproduction or translation of substantial portions of the web site, or any use other than for educational or other non-commercial purposes, require explicit, prior authorization in writing. Applications and enquiries should be addressed to the programme responsible for the page used.

The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. Dotted and dashed lines on maps represent approximate border lines for which there may not yet be full agreement.

The mention of specific companies or of certain manufacturers' products does not imply that they are endorsed or recommended by the World Health Organization in preference to others of a similar nature that are not mentioned. Errors and omissions excepted, the names of proprietary products are distinguished by initial capital letters.

The World Health Organization does not warrant that the information contained in the web site is complete and correct and shall not be liable whatsoever for any damages incurred as a result of its use.