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  Discovered the difference between measles and small pox
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  Forbaded anyone from practicing medicine without a liscence.
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  The symbol for medicine.
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  Tries to practice medicine but is denied
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  Considered one of the fathers of surgery and modern forensic pathology.
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  English medical doctor physicist
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  Discovered a vaccine for smallpox.
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  Sets out fees for surgeons and punishments for malpractice.
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  Performs the first successful transfusion of human blood.
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  Discovers antitoxins and uses them to develop tetanus and diphtheria vaccines.
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  Discovered X-Rays.
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  America's first cardiologists.
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  Discovers vitamin D and shows that its absence causes rickets.
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  Performs the first kidney transplant between identical twins.
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  Implants the Jarvik-7 artificial heart into patient Barney Clark. Clark lives 112 days.
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  Approves the first human clinical trials in the United States for a wearable artificial kidney designed by Blood Purification Technologies Inc. out of Beverly Hills, California.