In Reply to Zhang

International Journal of Radiation Oncology, Biology, Physics, Volume 99, Issue 2, 2017 Oct 1 | Parikh, Rahul R., MD; Grossbard, Michael L., MD; Harrison, Louis B., MD;...
To the Editor: We appreciate the opportunity to respond to this commentary regarding our article (1, 2). We agree that direct relationships between intervention and outcome (overall survival [OS] in this case) is quite difficult to ascertain from ...

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