Missy Franklin

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Missy Franklin of the United States rests in the water as he teammates, from left: Karlee Bispo, Shannon Vreeland and Katie Ledecky celebrate after winning the gold medal in the Women's 4x200m freestyle relay final at the FINA Swimming World Championships in Barcelona, Spain, Thursday, Aug. 1, 2013. (AP Photo/Michael Sohn)

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United States's Missy Franklin smiles after winning the gold medal in the Women's 200m freestyle final at the FINA Swimming World Championships in Barcelona, Spain, Wednesday, July 31, 2013. (AP Photo/Michael Sohn)

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Olympic swimmer Missy Franklin arrives at the MTV Video Music Awards on Thursday, Sept. 6, 2012, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

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United States' Shannon Vreeland, left, and Missy Franklin, right, embrace Allison Schmitt, foreground, and Dana Vollmer, center, after they won gold in the women's 4x200-meter freestyle relay swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Wednesday, Aug. 1, 2012. (AP Photo/Matt Slocum)

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United States' Missy Franklin competes in the women's 200-meter backstroke swimming semifinal at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. (AP Photo/Daniel Ochoa De Olza)

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United States' Shannon Vreeland, left, and United States' Missy Franklin, right, embrace United States' Allison Schmitt after they won gold in the women's 4x200-meter freestyle relay swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Wednesday, Aug. 1, 2012. (AP Photo/Michael Sohn)

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United States' Missy Franklin poses for photographers with her gold medal for the women's 100-meter backstroke swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Monday, July 30, 2012. (AP Photo/David J. Phillip)

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United States' Missy Franklin reacts to her gold nedal win in the women's 100-meter backstroke swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Monday, July 30, 2012. (AP Photo/Lee Jin-man)

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United States' Missy Franklin reacts after winning gold in the women's 100-meter backstroke swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Monday, July 30, 2012. (AP Photo/Mark J. Terrill)