[1] Massachusetts Gen Hosp, Dept Hematol, Boston, MA 02114 USA
[2] Hlth Outcomes Solut, Patient Reported Outcomes Res Dept, Winter Pk, FL USA
[3] Klinikum Justus Liebig Univ, Dept Hematol, Glessen, Germany
[4] Integris Canc Inst Oklahoma, Dept Hematol Oncol, Oklahoma City, OK USA
[5] St Johannes Hosp, Dept Hematol, Duisburg, Germany
[6] Amgen Inc, Dept Global Biostat Sci, Thousand Oaks, CA 91320 USA
[7] Amgen Inc, Dept Global Hlth Econ, Thousand Oaks, CA 91320 USA