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1) Photo Researchers Inc./Phototake
5) Will & Deni McIntyre / Photo Researchers, Inc.
6) Medical Body Scans/Photo Researchers Inc
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10) Robert Kirk/Photodisc
11) Eric Audras/PhotoAlto
12) Peter Dazeley/Photographer's Choice
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14) Zephyr / Photo Researchers, Inc
15) Rolf Bruderer/Blend Images
17) Arthur Tilley/Taxi
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20) Thomas J Peterson/Photographer's Choice
21) Jon Holloway/Phototake
22) hybrid medical animation / Photo Researchers, Inc
23) Kraig Scarbinsky/Lifesize
American Heart Association
Centers for Disease Control and Prevention
National Institutes of Health
National Stroke Association
The Stroke Association
Reviewed by James Beckerman, MD, FACC on April 29, 2016
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