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Archives of General Psychiatry|March 1, 1978
Comparative validity of random-interval and fixed-interval urinalysis schedulesR J Harford, H D KleberThe American Journal of Psychiatry|December 1, 1976
Effects of legal pressure on prognosis for treatment of drug dependenceR J Harford, J C Ungerer, J K KinsellaJournal of Clinical Psychology|October 1, 1976
Sex guilt and preferences for illegal drugs among drug abusersJ C Ungerer, R J Harford, F L Brown, et al.Radiology|December 1, 1992
Disparities in reimbursement to radiologists and nonradiologists for 65 common outpatient imaging studiesD C Levin, R B Edmiston, G F Rosetti, et al.Radiology|November 1, 1993
Self-referral in private offices for imaging studies performed in Pennsylvania Blue Shield subscribers during 1991D C Levin, R B Edmiston, J A Ricci, et al.Radiology|June 1, 1995
Trends in use of barium enema examination, colonoscopy, and sigmoidoscopy: is use commensurate with risk of disease?S Karasick, S M Ehrlich, D C Levin, et al.Radiology|December 1, 1993
Cost containment in the use of low-osmolar contrast agents: effect of guidelines, monitoring, and feedback mechanismsD C Levin, G A Gardiner, S Karasick, et al.Pageof 1