Concept
Version 12
Created by Boundless
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Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Doctor uses a stethoscope to examine a young patient."
http://commons.wikimedia.org/wiki/File:Doctor_uses_a_stethoscope_to_examine_a_young_patient.JPEG
Wikimedia
Public domain.