Quetiapine extended-release (Seroquel-XR) versus amitriptyline monotherapy for treating patients with fibromyalgia: a 16-week, randomized, flexible-dose, open-label trial - Elena P. Calandre; Fernando Rico-Villademoros; Jaime Galán; Rocio Molina-Barea; Juan S. Vilchez; Carmen M. Rodriguez-Lopez; Javier Hidalgo-Tallon; Piedad Morillas-Arques (Psychopharmacology, 2014)