1. From the Paediatric Emergency Service and Infectious Diseases Unit, Hospital Pediátrico, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
2. Faculty of Medical Sciences, Schools of Population Health Science and of Cellular and Molecular Medicine, University of Bristol, Coimbra, United Kingdom
3. School of Medicine, Universidade de Coimbra, Coimbra, Portugal.