1. Respiratory Department, Hospital Nacional de Niños, Costa Rica
2. Department of Pediatrics, Hospital Nacional de Niños and University of Costa Rica, San José, Costa Rica
3. School of Public Health, Tullane University, New Orleans, LA, USA
4. Emergency Department, Hospital Nacional de Niños, Costa Rica
5. Department of Infectious Diseases, Hospital Nacional de Niños, San José, Costa Rica
6. School of Veterinary Medicine, Population Medicine Research Program, National University of Costa Rica, Heredia, Costa Rica