Ethical Criteria for the Admission and Management of Patients in the ICU Under Conditions of Limited Medical Resources: A Shared International Proposal in View of the COVID-19 Pandemic - Tambone, Vittoradolfo; Boudreau, Donald; Ciccozzi, Massimo; Sanders, Karen; Campanozzi, Laura Leondina; Wathuta, Jane; Violante, Luciano; Cauda, Roberto; Petrini, Carlo; Abbate, Antonio; Alloni, Rossana; Argemi, Josepmaria; et al. (Frontiers in Public Health, 2020)