[1] Univ Montreal, Montreal, PQ, Canada
[2] Stat Canada, Ottawa, ON, Canada
[3] Univ Waterloo, Waterloo, ON, Canada
[4] Laval Univ, Quebec City, PQ, Canada
[5] Univ Sao Paulo, Sao Paulo, Brazil
[6] Montana State Univ, Bozeman, MT USA
[7] Inst Natl Sante Publ, Quebec City, PQ, Canada