[1] Univ Copenhagen, CSS, Dept Publ Hlth, Sect Hlth Serv Res,Ctr Healthy Ageing, DK-1014 Copenhagen, Denmark
[2] Univ So Denmark, Natl Inst Publ Hlth, Odense, Denmark
[3] Aarhus Univ Hosp, Dept Clin Epidemiol, Aarhus, Denmark
[4] Univ So Denmark, Inst Publ Hlth, Dept Clin Pharmacol, Odense, Denmark