1. Department of Epidemiology and Biostatistics, The University of Auckland, Auckland, New Zealand;
2. Department of Medicine, The University of Auckland, Auckland, New Zealand;
3. Department of Dermatology, Middlemore Hospital, Auckland, New Zealand;
4. Department of Emergency Medicine and Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA;
5. Ko Awatea, Centre for Research, Knowledge and Information Management, Auckland, New Zealand