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All rights reserved. Publications of the World Health Organization can be obtained from WHO Press... more All rights reserved. Publications of the World Health Organization can be obtained from WHO Press,
World Health Organization, 20 Avenue Appia, 1211 Geneva 27, Switzerland (tel.: +41 22 791 3264;
fax: +41 22 791 4857; e-mail: bookorders@who.int). Requests for permission to reproduce or translate WHO
publications — whether for sale or for noncommercial distribution — should be addressed to WHO Press, at
the above address (fax: +41 22 791 4806; e-mail: permissions@who.int).
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 lines on maps represent approximate border lines for which there may not yet be full agreement.
The mention of specifi c 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.
All reasonable precautions have been taken by the World Health Organization to verify the information
contained in this publication. However, the published material is being distributed without warranty of any
kind, either expressed or implied. The responsibility for the interpretation and use of the material lies with the
reader. In no event shall the World Health Organization be liable for damages arising from its use.
All rights reserved. Publications of the World Health Organization can be obtained from WHO Press... more All rights reserved. Publications of the World Health Organization can be obtained from WHO Press,
World Health Organization, 20 Avenue Appia, 1211 Geneva 27, Switzerland (tel.: +41 22 791 3264;
fax: +41 22 791 4857; e-mail: bookorders@who.int). Requests for permission to reproduce or translate WHO
publications — whether for sale or for noncommercial distribution — should be addressed to WHO Press, at
the above address (fax: +41 22 791 4806; e-mail: permissions@who.int).
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 lines on maps represent approximate border lines for which there may not yet be full agreement.
The mention of specifi c 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.
All reasonable precautions have been taken by the World Health Organization to verify the information
contained in this publication. However, the published material is being distributed without warranty of any
kind, either expressed or implied. The responsibility for the interpretation and use of the material lies with the
reader. In no event shall the World Health Organization be liable for damages arising from its use.