By Centers for Disease Control and Prevention; specific persons unknown - https://www.cdc.gov/std/stats/pdf/trends2006.pdfPDF via [1], accessed 2007-11-21, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3127891
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Imagen subida por davidgn el May 8, 2019.
Derechos de autor: Public Domain