Identifying congestion levels, sources and determinants on intensive care units: the Portuguese case Health Care Management Science Journal Article Diogo Ferreira Rui Marques Publication Year of Publication: 2018 Identifiers Other Numbers: 29087362 Locators URL https://doi.org/10.1007/s10729-016-9387-x DOI: 10.1007/s10729-016-9387-x Sustainable Development Goals