Barceló-Martinez, Ernesto, et al. “Serum Cortisol Levels and Neuropsychological Impairments in Patients Diagnosed With Fibromyalgia”. Actas Españolas De Psiquiatría, vol. 46, no. 1, Jan. 2018, pp. 1-11, https://actaspsiquiatria.es/index.php/actas/article/view/156.