[1] KATERI MEM HOSP CTR,KAHNAWAKE,PQ J0L 1B0,CANADA
[2] MCGILL UNIV,SMBD JEWISH GEN HOSP,DEPT FAMILY MED,MONTREAL,PQ,CANADA
[3] MONTREAL GEN HOSP,DIV PREVENT MED,MONTREAL,PQ H3G 1A4,CANADA
[4] MCGILL UNIV,DEPT EPIDEMIOL & BIOSTAT,MONTREAL,PQ,CANADA
[5] UNIV MONTREAL,DEPT SOCIAL & PREVENT MED,GRP RECH INTERDISCIPLINAIRE SANTE,MONTREAL,PQ,CANADA
[6] KAHNAWAKE EDUC CTR,KAHNAWAKE,PQ J0L 1B0,CANADA
[7] LONDON SCH HYG & TROP MED,HLTH SERV RES UNIT,LONDON WC1,ENGLAND