1. Hospital Universitario y Politécnico la Fe, 46026 Valencia, Spain
2. Biomedical Research Center Network for Respiratory Diseases (CIBERES), 28029 Madrid, Spain
3. Hospital Clinic, 08036 Barcelona, Spain
4. Hospital Galdakao-Usansolo, 48960 Galdácano, Spain
5. Hospital Alvaro Cunqueiro, Instituto de Investigación Biomédica Galicia Sur, 36312 Vigo, Spain
6. Biodonostia, Hospital Universitario Donostia, 20014 San Sebastián, Spain
7. Faculty of Health Sciences, Continental University, Huancayo 12001, Peru
8. Pfizer S.L.U., 28108 Madrid, Spain
9. Pfizer Vaccines, Collegeville, PA 19426, USA