[1] Univ Illinois, Coll Pharm, Ctr Pharmacoecon Res, Chicago, IL 60612 USA
[2] Univ Illinois, Coll Pharm, Dept Pharm Practice, Chicago, IL 60612 USA
[3] Univ Illinois, Coll Pharm, Dept Pharm Adm, Chicago, IL 60612 USA
[4] Hines VA Hosp, Midw Ctr Hlth Serv & Policy Res, Hines, IL USA
[5] United BioSource Corp, Hlth Care Analyt Grp, London, England