Transfusion;
Medicine;
and;
Apheresis;
Unit,;
Haematology;
and;
Haemotherapy;
Regional;
Service,;
"MiguelServet";
University;
Hospital,;
Zaragoza;
50009,;
Spain;
Gastroenterology;
Unit,;
University;
Clinical;
Hospital;
and;
Biomedical;
Investigation;
Center;
at;
Digestive;
and;
Hepatic;
Disease;
Network,;
c/San;
Juan;
Bosco;
15,;
Zaragoza;
50009,;
Spain;
Transfusion;
Medicine,;
School;
of;
Medicine,;
University;
of;
Malaga,;
Malaga;
29071,;
Spain;