Valente, R. F., C. Carmona, I. Serralheiro, M. Monteiro, P. Gomes, R. Santos, and S. Fonseca. “Portuguese Society of Anesthesiology Recommendations for the Treatment of Acute Pain 2018”. Journal of the Portuguese Society of Anesthesiology, vol. 28, no. 2, June 2019, pp. 102-9, doi:10.25751/rspa.15020.