| http://www.w3.org/ns/prov#value | - In one embodiment of the invention, the endoprosthesis is for use in facial cosmetic or reconstructive surgery and the hydrogel has a complex viscosity of about 2 to 100 Pas, preferably about 5 to 90 Pas, such as about 5 to 60 Pas, such as about 10 to 60 Pas.
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