Variations in Patterns of Utilization and Charges for the Care of Headache in North Carolina, 2000-2009: A Statewide Claims' Data Analysis.
Hurwitz EL, Vassilaki M, Li D, Schneider MJ, Stevans JM, Phillips RB, Phelan SP, Lewis EA, Armstrong RC. Variations in Patterns of Utilization and Charges for the Care of Headache in North Carolina, 2000-2009: A Statewide Claims' Data Analysis. J Manipulative Physiol Ther. 2016 05; 39(4):229-39.