Bigal, M. E.; Rapoport, A. M.; Sheftell, F. D.; Tepper, S. J. New Migraine Preventive Options: An Update With Pathophysiological Considerations . Rev. Hosp. Clín. 2002, 57 (6), 293-298. https://doi.org/10.1590/S0041-87812002000600009.