In {HEAD ~ yet other embodiments} of {TAIL ~ the invention}, the active agent is selected from the group consisting of: active agents comprising at least one paramagnetic element, active agents comprising at least one radioactive element, and fibrinolytic agents 
In { HEAD ~ yet other embodiments } of { TAIL ~ the invention } , the active agent is selected from the group consisting of : active agents comprising at least one paramagnetic element , active agents comprising at least one radioactive element , and fibrinolytic agents
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