Nowacki, L. C., Worfel, P. R., Martins, P. F. A., Santos, R. S. dos, Stechman-Neto, J., & Souza, W. M. de. (2015). Analgesic effect of Hypericum perforatum, Valeriana officinalis and Piper methysticum for orofacial pain. Brazilian Journal of Oral Sciences, 14(1), 60–65. Retrieved from https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8640847