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North and Oishi (2006), Phau and Liang (2012), Phau and Ng (2010), Rob and Waldfogel (2006), Rob and Waldfogel (2007), Robertson, Mcneill, Green and Roberts (2012), Sheehan, Tsao and Pokrywczynski (2012), Sheehan, Tsao and Yang (2010), Sinha and Mandel (2008), Sinha, Machado and Sellman (2010), Siponen, Vance and Willison (2012), Tanaka (2004), Taylor (2012), Tepper and Hargittai (2009), Wang and McClung (2011), Wang and McClung (2012), Wesselingh, Cristina and Tweeboom (2013), Wingrove, Korpas and Weisz (2011), Wolfe, Higgins and Marcum (2008), Yoon (2011)