1. Teesside University; Health and Social Care Institute; Middlesborough Tees Valley UK TS1 3BA
2. University of Alberta; Department of Emergency Medicine; Room 1G1.43 Walter C. Mackenzie Health Sciences Centre 8440 112th Street Edmonton Alberta Canada T6G 2B7
3. Kennedy Tower, 7th Floor; Department of Psychiatry; Royal Edinburgh Hospital University of Edinburgh, Morningside Edinburgh UK EH10 5HF
4. Maastricht University; Department of Epidemiology; P.O. Box 616 Maastricht Netherlands 6200 MD