[1] Ctr Hosp Pays de Gier, F-42400 St Chamond, France
[2] UJF Grenoble 1 CNRS TIMC IMAG UMR 5525, Equipe Environm & Predict Sante Populat EPSP, F-38000 Grenoble, France
[3] CHU St Etienne, Pole Mere Enfants, F-42055 St Etienne, France
[4] Univ St Etienne, EA NA Epis 4607, F-42023 St Etienne, France