[1] Leiden Univ Med Ctr, Publ Hlth & Primary Care, POB 9600, NL-2300 RC Leiden, Netherlands
[2] Goethe Univ Frankfurt Main, Inst Gen Practice, Frankfurt, Germany
[3] Bond Univ, Inst Evidence Based Healthcare, Fac Hlth Sci & Med, Gold Coast, Australia
[4] Univ British Columbia, Fac Pharmaceut Sci, Vancouver, BC, Canada
[5] Univ Oxford, Nuffield Dept Primary Care Hlth Sci, Med Stat, Oxford, England
[6] Univ Witten Herdecke, Helios Univ Hosp Wuppertal, Dept Clin Pharmacol, Witten, Germany
[7] Ctr Geriatr & Gerontol, Albertinen Haus, Hamburg, Germany
[8] Univ Med Ctr Eppendorf, Geriatr & Gerontol, Hamburg, Germany
[9] Univ Queensland, Primary Care Clin Unit, Fac Med, Brisbane, Qld, Australia
[10] Maastricht Univ, Care & Publ Hlth Res Inst, Dept Gen Practice, Maastricht, Netherlands