"Risk of Lower and Upper Gastrointestinal Bleeding, Transfusions, and Hospitalizations with Complex Antithrombotic Therapy in Elderly Patients"
Circ Sep 11
http://circ.ahajournals.org/content/early/2013/09/11/CIRCULATIONAHA.113.004747.abstract
"Conclusions—Among the elderly, CAT-related LGIE and UGIE is a clinically relevant risk resulting in increased hospitalizations and transfusions."