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. 2009 Mar 31;3(3):e404. doi: 10.1371/journal.pntd.0000404

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Unpublished Ministry of Public Health surveys from 1983 to 1991. Bars indicate the upper 95% confidence interval of the prevalence.