Rafael Dal-Ré1, Walter Orenstein2,3, Arthur L Caplan4. 1. Epidemiology Unit, Health Research Institute-Fundación Jiménez Díaz University Hospital, Universidad Autónoma de Madrid, Madrid, Spain. rafael.dalre@quironsalud.es. 2. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA. 3. Emory Vaccine Center, Emory University, Atlanta, GA, USA. 4. Division of Medical Ethics, Grossman School of Medicine, NYU Langone Medical Center, New York, NY, USA.