| http://www.w3.org/ns/prov#value | - Another advantage of the present invention is that the step of forming the crosslinking of the hydrogel can be performed with a crosslinking agent which may be external, such as for example ultraviolet radiation, or a crosslinking agent added to the hydrogel clear viscous monomer solution, which crosslinking agent may be, for example, ethylene glycol dimethacrylate or methymethacrylate.
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