[1] Fundacao Oswaldo Cruz, Unit Epidemiol & Biostat, Goncalo Moniz Res Ctr, BR-40295001 Salvador, BA, Brazil
[2] Hosp Sao Rafael, Salvador, BA, Brazil
[3] St Josephs Hlth Care, London, ON, Canada
[4] Pfizer Inc, New York, NY USA
[5] Inst Biomed Technol, Dept Epidemiol, Natl Res Council, Milan, Italy
[6] Columbia Univ, Sch Publ Hlth, Gertrude H Sergievsky Ctr, New York, NY USA
[7] Univ Chicago, Chicago, IL 60637 USA
[8] Univ Iowa, Iowa City, IA USA
[9] Southmead Gen Hosp, Bristol, Avon, England