Valença, M.M. , Andrade-Valença, L.P.A. and Costa, M.H. 2012. "Next time you have a headache, remember – pain is an illusion…". Headache Medicine. 3, 2 (Jun. 2012), 53–54. DOI:https://doi.org/10.48208/HeadacheMed.2012.12.