| http://www.w3.org/ns/prov#value | - Thus, by selecting an appropriate covering material, channel material and a thickness of the covering and/or channel wall, the release rate of a biologically active material can be controlled. [0063] Additionally, a further control can be possible by using wide variety of pharmaceutical forms of the drugs and carriers, such as bars, particles, gels, and fluids. [0064] The release rate of the biolo
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