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. 2014 Oct 9;8(10):e3192. doi: 10.1371/journal.pntd.0003192

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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.

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The number of physicians residing in Puerto Rico who had an active license to practice medicine is shown in the first box. A random sample of 2,512 physicians who were likely to diagnose and treat dengue patients were sent a survey as shown in the second box. Of the 2,313 physicians who received the survey (third box), 817 completed the questionnaire (fourth box). Of the 817 respondents, 109 were excluded because they were no longer practicing medicine (fifth box). For the analysis, the 708 physicians were separated into three mutually exclusive groups: board certified, residency training only, and no residency training.