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2. Abnormal head postures: a review;Davitt;Am Orthoptic J,2001
3. [New operation for nystagmus];Kestenbaum;Bull Soc Ophtalmol Fr,1953
4. Accuracy of clinical estimation of abnormal head postures;Kim;Binocul Vis Strabismus Q,2004
5. Marked variability amongst pediatric ophthalmologists in designating the diagnostic gaze position;Granet;Binocul Vis Strabismus Q,2001