1. Center of Investigation of Public Health, National Institute of Public Health, Cuernavaca, Morelos, México
2. Department of Pediatric Investigation, UNAMIS, Mérida, Yucatán, México
3. Influenza Vaccines Development, Novartis Influenza Vaccines, Cambridge, MA, USA
4. Vaccines R&D, GSK, Bs.As., Argentina
5. Vaccines R&D, GSK, Mexico City, México
6. Department of BioStatistics GSK, Amsterdam, The Netherlands
7. Clinical Development, Novartis Vaccines, Siena, Italy
8. Seasonal Influenza Vaccines, Seqirus, Amsterdam, The Netherlands