[1] Accident and Emergency Department, Medical Center Haaglanden, P.O. Box 432
[2] Department of Emergency Medicine, 4150 V Street, Sacramento 95817, CA
[3] Division of Clinical Methods and Public Health, Master Evidence Based Practice, Academic Medical Center and University of Amsterdam, P.O. Box 22660, Amsterdam 1100, DD
[4] Institute for Medical Technology Assessment, Erasmus University Rotterdam, P.O. Box 1738, Rotterdam 3000, DR