[1] Univ Hosp Schleswig Holstein, Dept Neurol, Div Neurol Pain Res & Therapy, Campus Kiel, Kiel, Germany
[2] Paris Saclay Univ, INSERM, CHU Ambroise Pare, AP HP,UVSQ,U987, Boulogne, France
[3] Univ Hosp Muenster, Dept Anaesthesiol Intens Care & Pain Med, Munster, Germany
[4] Novartis Pharm AG, Basel, Switzerland
[5] Bayer AG, Berlin, Germany
[6] Grunenthal Germany GmbH, Aachen, Germany
[7] Univ Klinikum Schleswig Holstein, Klin Neurol, Sekt Neurol Schmerzforsch & Therapie, Campus Kiel,Arnold Heller Str 3,Haus D, D-24105 Kiel, Germany