| http://www.w3.org/ns/prov#value | - A method for effecting surgery and therapy on humans and animals with lasers without undesired exposure of said humans, animals and other articles to stray laser beams, comprising the steps of(a) inserting a tubular article comprising at least one layer comprising a xerogel comprising at least one hydrophilic water-insoluble polymer, into the body cavity, of said human or animal, wherein said surg
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