Processing centers and filtration systems used. (A) Proportion of RBC units according to processing center. (B) Proportion of RBC units according to the filter used in each processing center. BFC, Bourgognne Franche Comté; CFD, Clermont-Ferrand; Fe, Fenwal; Fr, Fresenius; IDF, Ile de France; LIL, Lille; M, MacoPharma; NAN, Nancy; NDF, Nord de France; NIM, Nîmes; PAR, the Paris metropolitan area; STR, Strasbourg.