[1] INSERM U558, Dept Epidemiol, Toulouse, France
[2] CHU Purpan, INSERM U563, Toulouse, France
[3] Queens Univ Belfast, Dept Epidemiol & Publ Hlth, Belfast, Antrim, North Ireland
[4] INSERM U508, Lille, France
[5] Fac Med, Dept Epidemiol, Strasbourg, France
[6] Hop Paul Brousse, INSERM U258, Paris, France
[7] Hop Rangueil, INSERM U558, Toulouse 9, France