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Disclosure
Dr. Marcelo Bigal is an employee of Merck & Co. and owns stock interest in the company.
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Bigal, M.E. Expert Commentary–Unusual Headache Syndromes. Curr Pain Headache Rep 16, 287–288 (2012). https://doi.org/10.1007/s11916-012-0266-y
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DOI: https://doi.org/10.1007/s11916-012-0266-y