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Thompson WF, Schellenberg EG, Husain G.Thompson WF, et al. Among authors: schellenberg eg.Ann N Y Acad Sci. 2003 Nov;999:530-2. doi: 10.1196/annals.1284.067.Ann N Y Acad Sci. 2003.PMID: 14681180
Volkova A, Trehub SE, Schellenberg EG.Volkova A, et al. Among authors: schellenberg eg.Dev Sci. 2006 Nov;9(6):583-9. doi: 10.1111/j.1467-7687.2006.00536.x.Dev Sci. 2006.PMID: 17059455