1. NOVA Medical School, New University of Lisbon, 1150-082 Lisbon, Portugal
2. Department of Intensive Care, Hospital de São Francisco Xavier, Centro Hospitalar de Lisboa Ocidental, 1150-199 Lisbon, Portugal
3. Department of Intensive Care, Hospital da Luz Lisboa, 1500-650 Lisbon, Portugal
4. Lisbon School of Medicine, University of Lisbon (FMUL), 1649-028 Lisbon, Portugal
5. Department of Intensive Care, Hospital dos Lusíadas, 1500-458 Lisbon, Portugal
6. Center for Health Technology and Services Research (CINTESIS@RISE), Faculty of Medicine, University of Porto, 4200-450 Porto, Portugal
7. Department of Community Medicine, Information and Health Decision Sciences (MEDCIDS), Faculty of Medicine, University of Porto, 4200-450 Porto, Portugal
8. D’OR Institute for Research and Education, Rio de Janeiro 22281-100, Brazil
9. Post-Graduate Program, Federal University of Rio de Janeiro, Rio de Janeiro 21941-913, Brazil
10. Center for Clinical Epidemiology and Research Unit of Clinical Epidemiology, OUH Odense University Hospital, C 5000 Odense, Denmark