. A. Smitherman, R. Burch, H. Sheikh, and E. Loder, "The Prevalence, Impact, and Treatment of Migraine and Severe Headaches in the United States: A Review of Statistics from National Surveillance Stud- ies," Headache 53, no. 3 (Mar 7,2013): 427-36. 62 L. D. Goldberg, "The Cost of Migraine and its Treatment," America