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Dr. Allan Ropper speaks with residents and fellows as they do rounds at the neuroscience intensive care unit at Brigham and Women's Hospital in Boston. M. Scott Brauer for NPR hide caption

itoggle caption M. Scott Brauer for NPR

Emily Whittington, a radiation therapist at Vanderbilt-Ingram Cancer Center, pulls down a mask intended to guide radiation beams into patients with head and neck cancer. Emily Siner/NPR hide caption

itoggle caption Emily Siner/NPR