J. R. de Andrade, C. C. de L. Santana, B. F. N. de Souza, F. . Cruz, and M. M. Valença, “Headache frequency among 71,267 admissions to an adult medical emergency in the city of Recife in 2021”, Headache Med, vol. 13, no. Supplement, p. 39, Oct. 2022.