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Lee BB, Cooper B, Cao D.Lee BB, et al. Among authors: cao d.Vision Res. 2018 Oct;151:141-151. doi: 10.1016/j.visres.2017.05.013. Epub 2017 Jul 19.Vision Res. 2018.PMID: 28709923Free article.
Shevell SK, Cao D.Shevell SK, et al. Among authors: cao d.Vision Res. 2006 Jan;46(1-2):106-16. doi: 10.1016/j.visres.2005.06.020. Epub 2005 Aug 10.Vision Res. 2006.PMID: 16095652Free article.