Subramanian, A. C., T. P. Devi, K. Ravikumar, and V. Sivagamasundari. “Clinical Profile and Disability of Children Presenting With Chronic Daily Headache in a Tertiary Care Hospital”. International Journal of Contemporary Pediatrics, vol. 5, no. 3, Apr. 2018, pp. 843-6, doi:10.18203/2349-3291.ijcp20181499.