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INTRODUCTION In late March and early April 2009, an outbreak of H1N1 influenza A virus infection was detected in Mexico, with subsequent cases observed in many other countries including the United States 1~2 1,2 . On June 11, 2009, the World Health Or
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The professional version of UpToDate is often the first online resource doctors check when questions arise in the hospital or in the office. Many hospitals make this clinical resource freely available to the hospital staff. Compared to the professional version, the patient information section is small but very useful and highly trusted.
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