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HARTSOCK et al. (1965) "NORMAL VARIATIONS WITH AGING OF THE AMOUNT OF HEMATOPOIETIC TISSUE IN BONE MARROW FROM THE ANTERIOR ILIAC CREST. A STUDY MADE FROM 177 CASES OF SUDDEN DEATH EXAMINED BY NECROPSY." Am. J. Clin. Pathol. 43:326-331 (PubMed)