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<http://webisa.webdatacommons.org/50100194>	<http://www.w3.org/ns/prov#value>	"Using microcatheters, stents, balloons and other endovascular devices ??? including the Penumbra System?? and Merci?? Retrieval System ??? Dr. Razack can directly target and physically remove blood clots from the brains of stroke patients." .