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Belgium (All Seasons) - Survey frequency

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Belgium 2022 - 2023 Survey frequency
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Belgium 2021 - 2022 Survey frequency
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Belgium 2020 - 2021 Survey frequency
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Belgium 2010 - 2011 Survey frequency
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Belgium 2009 - 2010 Survey frequency
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Belgium 2008 - 2009 Survey frequency
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Belgium 2007 - 2008 Survey frequency
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Belgium 2006 - 2007 Survey frequency
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Belgium 2005 - 2006 Survey frequency
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Belgium 2004 - 2005 Survey frequency

Sources: Influenzanet, Google Flu Trends, EISN, NOAA.

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