A randomized controlled trial of the accuracy of clinical record retrieval using SNOMED-RT as compared with ICD9-CM. - Peter L. Elkin; Alexander Ruggieri; Steven H. Brown; James D. Buntrock; Brent A. Bauer; Dietlind Wahner-Roedler; Scott Litin; Julie Beinborn; Kent R. Bailey; Larry Bergstrom (AMIA, 2001)