Source: Cropped from <a rel="nofollow" class="external autonumber" href="https://www.nlm.nih.gov/changingthefaceofmedicine/img/gallery/211_12.jpg">[1]</a> at <a rel="nofollow" class="external autonumber" href="https://www.nlm.nih.gov/changingthefaceofmedicine/gallery/photo_211_3.html">[2]</a>.
<a rel="nofollow" class="external free" href="https://cfmedicine.nlm.nih.gov/gallery/photo_211_3.html">https://cfmedicine.nlm.nih.gov/gallery/photo_211_3.html</a>