Affiliation: | 1. Department of Molecular Microbiology, University Hospital Sant Joan de Déu, P° Sant Joan de Déu, n° 2, 08950, Esplugues, Barcelona, Spain 2. Department of Paediatrics, Hospital Sant Joan de Déu and University of Barcelona, Esplugues, Barcelona, Spain 3. Public Health Agency, Government of Catalonia, Barcelona, Spain 4. Department of Public Health, University of Barcelona, Barcelona, Spain 5. CIBER Epidemiologia y Salud Pública (CIBERESP), Madrid, Spain
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