1. Medical University of Vienna; Department of Emergency Medicine; Währinger Gürtel 18-20 Vienna Austria A-1090
2. University of Utah; Department of Anesthesiology; 3C444 SOM 30 North 1900 East Salt Lake City UT USA 84132-2304
3. The Chinese University of Hong Kong; Department of Anaesthesia and Intensive Care; Prince of Wales Hospital Shatin New Territories Hong Kong
4. The Chinese University of Hong Kong; Hong Kong Branch of The Chinese Cochrane Centre, The Jockey Club School of Public Health and Primary Care, Faculty of Medicine; Shatin New Territories Hong Kong
5. Lund University; Clinical Health Promotion Centre, Faculty of Medicine; Skånes Universitetssjukhus, Södra Förstadsgatan 35, Plan 4 Malmö Sweden S-205 02