1. Emergency Room, Coimbra University Hospital, Avenida Bissaya Barreto e Praceta Prof. Mota Pinto, 3000-075 Coimbra, Portugal
2. Department of Health, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
3. Center for Research and Development in Mathematics and Applications, Department of Mathematics, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
4. College of Nursing, New York University, 726 Broadway, New York, NY 10003, USA