1. The Queen Elizabeth Hospital; Department of Medicine, University of Adelaide; Adelaide Australia
2. Leiden University Medical Center; Department of Public Health and Primary Care; PO Box 9600 Leiden Netherlands 2300 RC
3. The Queen Elizabeth Hospital; Clinical Practice Unit; 4A Main Building 28 Woodville Road Woodville South Adelaide South Australia Australia 5011
4. University of South Australia; Division of Health Sciences; Adelaide Australia
5. Radboud University Nijmegen Medical Center; Department of Primary and Community Care, 117 ELG; PO Box 9101 route 117 Nijmegen Netherlands 6500 HB