1. Medical Affairs Department, MSD Spain, Madrid, Spain
2. Instituto Hispalense de Pediatría, Sevilla, Spain
3. Binissalem Healthcare Center, Illes Balears, Spain
4. Burriana II Healthcare Center, Valencia, Spain
5. Les Hortes Healthcare Center, Barcelona, Spain
6. Instituto Hispalense de Pediatría, Córdoba, Spain
7. Pediatrician at Illescas Healthcare Center, Toledo, Spain
8. Nazaret Healthcare Center, Valencia, Spain
9. Primary Care Pediatrician in Guanarteme Healthcare Center, Las Palmas and Member of the Vaccine Advisory Committee of the Spanish Association of Pediatrics