How does blood donation influence heart function

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I need you to write research abstract only!! no more than 2-3 pages! APA style. it is to be obtained from MEDLINE, CINAHL, or other medical referenced journals dated from 2000 or newer. it should include the authors name, date, article title, journal name, volume, and number. It should be typed, double-spaced and no longer than 2-3 pages in length summarizing the authors intentions and your thoughts on the question (the last paragraph).

please include links of the sources.