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The simulated performance of the probe design based on various combinations of ball lens diameters (i.e., 1, 2, 3, 5, 8 and 10 mm) and refractive indices (i.e., 1.46, 1.51, 1.63, 1.76 and 1.83): (a) collection efficiency; (b) Proportion of the Raman photons from the epithelium to the total collected Raman photons from the tissue surface.
