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Callaghan, Brian C., James F. Burke, Kevin A. Kerber, Lesli E. Skolarus, John P. Ney, Brandon Magliocco, ja Gregory J. Esper. "The Association of Neurologists With Headache Health Care Utilization and Costs." Neurology 2018.

Callaghan, Brian C., et al. "The Association of Neurologists With Headache Health Care Utilization and Costs." Neurology 2018.