MY gave statistics support, contributed to data evaluation and helped to draft the manuscript.
All authors participated in data evaluation and experimental design.
Data used stemmed from two representative national surveys conducted by French National Institute of Statistics and Economic Studies and the French Head Office of Research, Studies, Evaluation and Statistics of the Social Affairs Ministry in 2008.
GZ participated in planning of the study, evaluation of patients, data and statistics and has seen and approved the final version, HS-G participated essentially in establishment of laboratory analyses, their evaluation and statistics, but unfortunately died before submission of this study.
From 1999 to 2001, he was Associate Commissioner for Research, Evaluation, and Statistics at Social Security.
PAG participated in planning of the study, supervision of the study, evaluation of patients, data and statistics and has seen and approved the final version.
CW participated substancially in planning of the study, supervision of the study, evaluation of patients, data and statistics and has seen and approved the final version.
AM participated in planning of the study, evaluation of patients, data and statistics and has seen and approved the final version.
LK participated substantially in planning of the study, supervision of the study, evaluation of patients, data and statistics and has seen and approved the final version.
AS participated in planning of the study, evaluation of patients, data and statistics and has seen and approved the final version.
