Jorge Vas1
, Ángel Rebollo2
, Emilio Perea-Milla3
, Camila Méndez4
, Carlos Ramos Font2
, Manuel Gómez-Río2
, Manuel Martín-Ávila5
, Justo Carbrera-Iboleón6
, M Dolores Caballero7
, M Ángeles Olmos8
, Inmaculada Aguilar1
, Vicente Faus9
and Francisco Martos10 
1Pain Treatment Unit, Primary Care Center, Dos Hermanas, Spain
2Service of Nuclear Medicine, Virgen de las Nieves Hospital, Granada, Spain
3Support Research Unit (Network and Cooperative Research Centers of Epidemiology. CIBERESP) Costa del Sol Hospital, Marbella, Spain
4Andalusian Public Health System, Sevilla, Spain
5Armilla Primary Care Center, Granada, Spain
6Valle de Lecrin Primary Care Center, Granada, Spain
7Pain Clinic, Virgen de las Nieves Hospital, Granada, Spain
8Ugijar Primary Care Center, Granada, Spain
9Service of Pharmacology, Costa del Sol Hospital, Marbella, Spain
10Department of Pharmacology, Malaga University, Spain