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was first recognized by Thomson in 1900, but his original cases were not reported until later (Hender-son and Ellis, 1940). Although about 200 cases have been reported, there are few detailed studies of the cardiovascular system. Necropsy material is rare, and has been reviewed by Strauss (1948) and Lindsay (1950). Since then other necropsies have been reported by Jervis (1950), Magee
R Emanuel (Fri,) studied this question.
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