RT Journal
A1 Patel R, Josephson CD
T1 STorage age of red blood cells for transfusion of premature infants
JF JAMA
JO JAMA
YR 2013
FD February 13
VO 309
IS 6
SP 544
OP 545
DO 10.1001/jama.2012.177439
UL http://dx.doi.org/10.1001/jama.2012.177439
AB 
The ARIPI study has excellent internal validity, whereas external validity requires further assessment before the results are generalized to blood banking and transfusion practices beyond the institutions in the study and those outside of Canada. Three differences may influence the generalizability of the ARIPI study.