- NLM Digital Collections - Proton beam therapy : final evidence reportPublication: [Boston, MA] : Institute for Clinical and Economic Review, [2014]... P. Visual complications of proton beam therapy for clival chordoma. Eye. 2003;17(3):318-323. 27. Brown ... loss: 1% Grade 4 visual: 1% Bowyer (2003) Clival chordoma N=4 • PBT + photon, • Mean: 34 • Overall survival: ...
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