1. Transfusion Medicine Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
2. Anesthesiology Department, Hospital de São José, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
3. Gastroenterology Department, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal
4. Gastroenterology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
5. Anesthesiology Department, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
6. Transfusion Medicine Department, Hemovida, Lisbon, Portugal
7. Transfusion Medicine Department, Centro Hospitalar Universitário de São João, Porto, Portugal
8. Transfusion Medicine Department, Hospital das Forças Armadas, Lisbon, Portugal
9. Gastroenterology Department, Hospital Santo António dos Capuchos, Centro Hospitalar Universitário Lisboa Central, Lisbon, Portugal
10. Anesthesiology Department, Hospital Lusíadas, Porto, Portugal
11. Anesthesiology Department, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal