chang et. al 1998, chang et al 2014, chen et al. 1998, wang et al. 1998, chan et al 2011, chan et al. 2006, chan et al. 2007, chan et al. 2012, jang et al. 2007, chung et al. 1997, chung et al. 2004, lang et al. 2012, chung et al. 2002
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