Mode Equivalence of Interactive Voice Response (IVR) and Paper Versions of the Brief Pain Inventory (BPI) “Worst Pain” Item in Metastatic Castrate Resistant Prostate Cancer (mCRPC) Evaluated Conceptually Using Qualitative Methods. - Bennett, A.; Eremenco, S.; Heon, N.; Scheffold, C.; Schimmoller, F.; Weitzman, A.; Basch, E. (Value in Health, 2013)