1. Colegio de Ciencias de la Salud Universidad San Francisco de Quito Quito Ecuador
2. Laboratorio de Investigaciones FEPIS Quinindé Ecuador
3. Asthma and Allergic Diseases Center University of Virginia Charlottesville VA USA
4. Instituto de Saude Coletiva Universidad Federal da Bahia Salvador Brazil
5. Department of Infectious Disease Epidemiology London School of Hygiene and Tropical Medicine London UK
6. Centro de investigacion en Enfermedades Infecciosas Pontificia Universidad Católica del Ecuador Quito Ecuador
7. Institute of Infection and Immunity St George's University of London London