Bigal, Marcelo E., Alan M. Rapoport, Fred D. Sheftell, and Stewart J. Tepper. 2002. “ New Migraine Preventive Options: An Update With Pathophysiological Considerations ”. Revista Do Hospital Das Clínicas 57 (6): 293-98. https://doi.org/10.1590/S0041-87812002000600009.