Fiero MH, Pe M, Weinstock C, King-Kallimanis BL, Komo S, Klepin HD, Gray SW, Bottomley A, Kluetz PG, Sridhara R. Demystifying the estimand framework: a case study using patient-reported outcomes in oncology. Lancet Oncol. 2020 10; 21(10):e488-e494.