1. Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal
2. Institute of Childcare and Pediatrics Martagão Gesteira, Federal University of Rio de Janeiro, Rua Bruno Lobo, 50, Rio de Janeiro 21941-912, Brazil
3. National Medicine Academy, Rio de Janeiro 20021-130, Brazil
4. Maternity School, Federal University of Rio de Janeiro, Rio de Janeiro 22240-001, Brazil
5. Department Infectious Diseases, School of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro 21044-020, Brazil