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Inter-fraction Variation: Implanted Markers and CBCTs
 Systematic errors of 3.5 to 6.6 mm depending on the direction
 Random errors of 2.5 to 4.7 mm depending on the direction
Horst van der A, Int J Radiation Oncol Biol Phys, Vol. 87, No. 1, pp. 202e208, 2013