[1] Agencia Salut Publ Barcelona, Barcelona 08023, Spain
[2] Univ Autonoma Barcelona, E-08193 Barcelona, Spain
[3] Univ Med Ctr, Erasmus MC, Dept Publ Hlth, Rotterdam, Netherlands
[4] Univ Turin, Dept Publ Hlth & Microbiol, Turin, Italy
[5] Stat Denmark, Copenhagen, Denmark
[6] Univ Zurich, Inst Social & Prevent Med, CH-8006 Zurich, Switzerland
[7] Stat Norway, Div Hlth Stat, Oslo, Norway
[8] Free Univ Brussels, Brussels, Belgium
[9] Off Natl Stat, Hlth & Care Div, London, England
[10] Univ Bern, Inst Social & Prevent Med, CH-3012 Bern, Switzerland
[11] Univ Madrid, Dept Prevent Med & Publ Hlth, Madrid 3, Spain
[12] Univ Helsinki, Dept Sociol, Helsinki, Finland