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  1. Childhood Chordoma Treatment (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK552289
    ... MS, Hulou MM, Almefty K, et al.: Pediatric Clival Chordoma: A Curable Disease that Conforms to Collins' Law. ... et al.: The role of chemotherapy in pediatric clival chordomas. J Neurooncol 103 (3): 657-62, 2011. [ PubMed : ...
  2. NLM Digital Collections - Proton beam therapy : final evidence report 
    Publication: [Boston, MA] : Institute for Clinical and Economic Review, [2014]
    resource.nlm.nih.gov/101636381
    ... 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: ...