[1] Clermont Auvergne Univ, Fac Med, Dept Gen Practice, EA7280, 28 Pl Henri Dunant,BP 38, F-63001 Clermont Ferrand, France
[2] Univ Hosp Clermont Ferrand, Clin Res & Innovat Dept, F-63001 Clermont Ferrand, France
[3] Clermont Auvergne Univ, Fac Med, Observ Francais Medicaments Antalg OFMA, Neurodol,Dept Gen Practice,Inserm 1107, F-63001 Clermont Ferrand, France
[4] Clermont Auvergne Univ, Dept Gen Practice, UPU ACCePT, Fac Med, F-63001 Clermont Ferrand, France
[5] Pierre & Marie Curie Univ, Dept Gen Practice, Fac Med, F-75005 Paris, France