Evaluation of the efficacy of memantine in the treatment of fibromyalgia: study protocol for a doubled-blind randomized controlled trial with six-month follow-up
Bárbara Olivan-Blázquez, Marta Puebla, Bárbara Masluk, Mari-Cruz Pérez-Yus, Raquel Arcega, Eva Andrés, Yolanda López-del-Hoyo, Rosa Magallon, Miquel Roca and Javier Garcia-Campayo*