[1] Univ Illinois, Ctr Pharmacoecon Res, Dept Pharm Practice, Coll Pharm, Chicago, IL 60607 USA
[2] GlaxoSmithKline Inc, Global Hlth Outcomes, Collegeville, PA USA
[3] Northwestern Univ, Ctr Outcomes Res & Educ, Evanston Hleathcare, Chicago, IL 60611 USA
[4] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA