1. Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research , Chandigarh , India
2. Pfizer Inc. , New York , USA
3. Pfizer International Operations , Paris , France
4. Pfizer Hospital Medical Affairs, Pfizer , Congleton , UK
5. WRD & Medical, Pfizer , Cambridge, Massachusetts , USA
6. Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón , Madrid , Spain
7. Instituto de Investigación Sanitaria Hospital Gregorio Marañón , Madrid , Spain
8. Medicine Department, School of Medicine, Universidad Complutense de Madrid , Madrid , Spain
9. CIBER Enfermedades Respiratorias – CIBERES (CB06/06/0058) , Madrid , Spain