[1] Pellegrin Univ, Teaching Hosp, Dept Treatment Chron Pain Patients, Bordeaux, France
[2] Hop Rangueil, Dept Neurol, Toulouse, France
[3] Lariboisiere Hosp, Emergency Headache Ctr, Paris, France
[4] Salengro Hosp, Neurol Clin, Lille, France
[5] Schwarz Pharma France, Boulogne, France
[6] Pasteur Univ, Teaching Hosp, Dept Evaluat & Treatment Pain, Nice, France