The vast majority of young physicians surveyed by Stanford researchers wouldn't want to receive CPR or cardiac life support if they were terminally ill and their heart or breathing stopped. UygarGeographic/iStockphoto hide caption

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Dr. Lisa Sterman held a Truvada pill at her office in San Francisco in 2012. She prescribed Truvada to patients at high risk for HIV infection even before the Food and Drug Administration approved the medicine explicitly for that purpose. Jeff Chiu/AP hide caption

itoggle caption Jeff Chiu/AP

Red blood cells infected with the Plasmodium falciparum parasite. Plasmodium is the parasite that triggers malaria in people. Gary D. Gaugler/Science Source hide caption

itoggle caption Gary D. Gaugler/Science Source

Two cervical cancer cells divide in this image from a scanning electron microscope. Steve Gschmeissner/Getty Images/Science Photo Libra hide caption

itoggle caption Steve Gschmeissner/Getty Images/Science Photo Libra

Walter Bianco's liver is severely damaged by hepatitis C, but insurers had refused to pay for the medications that could cure him. Alexandra Olgin for NPR hide caption

itoggle caption Alexandra Olgin for NPR

The mask of this Kiev protester (at a 2012 demonstration demanding more funding for HIV treatment) reads "quarantine." There are enough drugs to treat only half the HIV patients in Ukraine. Sergei Supinsky/AFP/Getty Images hide caption

itoggle caption Sergei Supinsky/AFP/Getty Images

Walter Bianco's liver is severely damaged by hepatitis C, but insurers had refused to pay for the medications that could cure him. Alexandra Olgin for NPR hide caption

itoggle caption Alexandra Olgin for NPR