[1] Northwestern Univ, Chicago, IL 60611 USA
[2] Imperial Coll Med, London, England
[3] Akad Ziekenhuis, Louvain, Belgium
[4] Welch Cntr Epidemiol, Baltimore, MD USA
[5] Kanazawa Med Univ, Ishikawa, Japan
[6] Univ Minnesota, Minneapolis, MN USA
[7] Fu Wai Hosp, Beijing, Peoples R China
[8] Cardiovasc Inst, Beijing, Peoples R China