[1] Acad Med Ctr Amsterdam, Dept Vasc Med, Amsterdam, Netherlands
[2] Univ Iowa, Dept Epidemiol, Iowa City, IA USA
[3] Univ Iowa, Dept Med, Iowa City, IA 52242 USA
[4] Univ Witwatersrand, Dept Med, ZA-2001 Johannesburg, South Africa
[5] Inst Rech Clin Montreal, Hypertens Clin, Montreal, PQ H2W 1R7, Canada
[6] Royal Prince Alfred Hosp, Dept Clin Biochem, Camperdown, NSW 2050, Australia
[7] Avondale Surg, Chesterfield, England
[8] Univ Minnesota, Sch Med, Minneapolis, MN 55455 USA
[9] Amgen Inc, Thousand Oaks, CA 91320 USA
[10] Jacksonville Ctr Clin Res, Jacksonville, FL USA