| http://www.w3.org/ns/prov#value | - The encapsulated or stabilised gas bubbles are filled with a gas or a gas mixture comprising a physiologically acceptable gas selected from the group consisting of fluorinated gases, including sulfur hexafluoride, trifluoromethylsulfur pentafluoride, Freons??? (e.g. organic compounds containing one or more carbon atoms and fluorine such as CF4, CBrF3, C4F8, CClF3, CCl2F2, C2F6, C2ClF5, CBrClF2, CB
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