Esch, P.; Centre for Health Studies, Centre de Recherche Public de la Sante´, Rue Thomas Edison 1 A-B, Strassen 1445, Luxembourg, Department of Clinical Sciences, University of Lie`ge, Avenue de l'Hoˆpital 13, Lie`ge 4000, Belgium
Bocquet, V.; Competence Centre of Methodology and Statistics, Centre de Recherche Public de la Sante´, Rue Thomas Edison 1 A-B, Strassen 1445, Luxembourg
Pull, C.; Department of Psychiatry, Centre Hospitalier de Luxembourg, Rue Ernest Barble´ 4, Luxembourg 1210, Luxembourg
Couffignal, S.; Centre for Health Studies, Centre de Recherche Public de la Sante´, Rue Thomas Edison 1 A-B, Strassen 1445, Luxembourg
Lehnert, T.; Department of Psychiatry, Centre Hospitalier du Kirchberg, Rue Edward Steichen 9, Luxembourg 2540, Luxembourg
Graas, M.; Centre Hospitalier Neuro-Psychiatrique, Avenue des Allie´s 17, Ettelbruck 9002, Luxembourg
Fond-Harmant, L.; Centre for Health Studies, Centre de Recherche Public de la Sante´, Rue Thomas Edison 1 A-B, Strassen 1445, Luxembourg