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Drain JP, Virk SS, Jain N, Yu E. Dropped head syndrome: a systematic review. Clin Spine Surg 32: 423-429, 2019.","DOI":"10.1097\/BSD.0000000000000811"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Alhammad RM, Naddaf E. Myopathies presenting with head drop: clinical spectrum and treatment outcomes. Neuromuscul Disord 30: 128-136, 2020.","DOI":"10.1016\/j.nmd.2019.12.001"},{"key":"3","doi-asserted-by":"publisher","unstructured":"3. Katz JS, Wolfe GI, Burns DK, Bryan WW, Fleckenstein JL, Barohn RJ. Isolated neck extensor myopathy: a common cause of dropped head syndrome. Neurology 46: 917-921, 1996.","DOI":"10.1212\/WNL.46.4.917"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Larsen H, Bogaard PW, Oppel L. A case of isolated neck extensor myopathy responding favorably to immunotherapy. J Clin Neuromuscul Dis 15: 73-76, 2013.","DOI":"10.1097\/CND.0000000000000015"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. 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