1. Department of Epidemiology and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology at Cabrini Hospital; Suite 41, Cabrini Medical Centre 183 Wattletree Road Malvern Victoria Australia 3144
2. Monash University; Monash Institute of Health Services Research; Monash Medical Centre Locked Bag 29 Clayton Victoria Australia 3168
3. St John of God Hospital Subiaco; c/- Ivy Suite Bendat Family Comprehensive Cancer Centre; 12 Salvado Road Subiaco Australia 6008
4. Leiden University Medical Centre; Department of Public Health and Primary Care; PO Box 9600, Postzone V 06-P Leiden Netherlands 2300 RC
5. Concord Hospital; Department of Rheumatology; Concord New South Wales Australia
6. Leiden University Medical Center; Department of Public Health and Primary care; V0-6P (room 14) P.O. Box 9600 Leiden Netherlands 2300 RC LEIDEN