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Tonkopi E, Chi PC, Mawlawi O, Riegel AC, Rohren EM, Macapinlac HA, Pan T.Tonkopi E, et al. Among authors: rohren em.J Appl Clin Med Phys. 2010 Feb 4;11(1):3073. doi: 10.1120/jacmp.v11i1.3073.J Appl Clin Med Phys. 2010.PMID: 20160693Free PMC article.