Jessica D. Tenenbaum, Colette Blach, Guilherme Del Fiol, Chandel Dundee, Julie Frund, Michelle Smerek, Anita Walden, Rachel L. Richesson: Use of RxNorm and NDF-RT to Normalize and Characterize Participant-reported Medications in a Research Repository: Pbstacles and Achievements. AMIA 2013