N Engl J Med 2016 Jul;375(2):134-42
From Indiana University School of Medicine-South Bend, South Bend (R.M.N.); Alliance Statistics and Data Center, Mayo Clinic (R.Q., H.L.), and Mayo Clinic (K.J.R., J.M.L., C.L.L.), Rochester, MN; Sanford NCORP (National Cancer Institute Community Oncology Research Program) of the North Central Plains, Sioux Falls, SD (S.F.P.); Illinois Cancer Care-Peoria, Peoria (M.B.); Gundersen Lutheran Medical Center, La Crosse, WI (L.D.); and Delaware-Christiana Care NCORP, Newark, DE (D.B.).