| Studies Using this Level of Aggregation:
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Bhattacharjee, Gopal, Lertwachara and Marsden (2006b), Frank N. Magid Associates (2009), Higgins, Wolfe and Ricketts (2009), Peitz and Waelbroeck (2004), Sandulli (2007), Sandulli and Martin-Barbero (2007), Shanahan and Hyman (2010)
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