| Studies that use this data source:
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Adermon and Liang (2011), Borghi, Maggiolino, Montagnani and Nuccio (2012), Ki, Chang and Khang (2006), Montoro-Pons and Cuadrado-García (2006), Pollock (2009), Sanchez-Graells and Santaló (2007), Sandulli (2007), Sandulli and Martin-Barbero (2007), Zentner (2005), Zentner (2009)
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