J Am Med Inform Assoc
http://www.ncbi.nlm.nih.gov/pubmed/23349080
20(e1):e155-61
https://connects.catalyst.harvard.edu/Profiles/profile/319035
Federated queries of clinical data repositories: the sum of the parts does not equal the whole.
J Am Med Inform Assoc
http://www.ncbi.nlm.nih.gov/pubmed/23349080
20(e1):e155-61
https://connects.catalyst.harvard.edu/Profiles/profile/319035