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Quattrone, A., Morelli, M., Nisticò, R. et al. Dropped head syndrome in a patient with FTD-ALS caused by abnormal expansion of C9orf72 gene. Neurol Sci 41, 951–952 (2020). https://doi.org/10.1007/s10072-019-04079-9
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DOI: https://doi.org/10.1007/s10072-019-04079-9