[1] Med Sch Hannover, Inst Epidemiol Social Med & Hlth Syst Res, OE 5410,Carl Neuberg Str 1, D-30625 Hannover, Germany
[2] Goethe Univ Frankfurt Main, Inst Wirtschaft Arbeit & Kultur, Senckenberganlage 31, D-60325 Frankfurt, Germany
[3] Netherlands Inst Hlth Serv Res, NIVEL POB 1568, NL-3500 BN Utrecht, Netherlands
[4] Univ Utrecht, Dept Human Geog, Dept Sociol, NIVEL POB 1568, NL-3500 BN Utrecht, Netherlands
[5] Univ Aberdeen, Aberdeen, Scotland
[6] Aarhus Univ, Dept Publ Hlth, Bartholins Alle 2, DK-8000 Aarhus C, Denmark
[7] Newcastle Univ, Royal Victoria Hosp, Sir James Spence Inst, Inst Hlth & Soc, Queen Victoria Rd, Newcastle NE1 4LP, England