[1] Univ Med Ctr Rotterdam, Erasmus MC, Dept Publ Hlth, NL-3000 DR Rotterdam, Netherlands
[2] Stat Denmark, Res & Methodol, Copenhagen, Denmark
[3] Univ Zurich, Inst Social & Prevent Med, CH-8006 Zurich, Switzerland
[4] Stat Norway, Div Hlth Stat, Oslo, Norway
[5] Municipal Hlth Serv, Barcelona, Spain
[6] Univ Turin, Dept Microbiol & Publ Hlth, I-10124 Turin, Italy
[7] Free Univ Brussels, B-1050 Brussels, Belgium
[8] INED, Paris, France
[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, Spain
[12] Univ Helsinki, Dept Sociol, FIN-00014 Helsinki, Finland