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(Circulation. 1958;18:41.)
© 1958 American Heart Association, Inc.

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Changing Frequency of Arteriosclerosis in Mammals and Birds at the Philadelphia Zoological Garden

Review of Autopsy Records

H. L. RATCLIFFE SC.D.¹ M. T.I. CRONIN M.R.C.V.S., PH.D.¹

¹ From the Penrose Research Laboratory, Zoological Society of Philadelphia and the Department of Pathology, School of Medicine, University of Pennsylvania, Philadelphia, Pa.

From 1901 through 1932 arteriosclerosis was found in less than 3 per cent of autopsies on mammals and birds at the Philadelphia Zoological Garden, but thereafter its frequency has increased to about 20 per cent. This study has attempted to identify factors that may be associated with this change in frequency.

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