1. Hospital Infanta Sofía, San Sebastián de los Reyes, Madrid, Spain
2. Consorcio Hospitalario Provincial de Castellón, Pain Unit, Castellón, Spain
3. Kyowa Kirin Farmacéutica, S.L.U., Medical Department, Madrid, Spain
4. E-C-BIO, S.L., Medical Department, Las Rozas, Madrid, Spain