These are some sources for examples of data visualization used in healthcare:

• The Agency for Healthcare Research and Quality:
https://bit.ly/2GJ6kHA;

• Visualizing Health, from the Robert Wood Johnson Foundation and the University of Michigan Center for Health Communications Research: http://www.vizhealth.org/gallery/;

• The Institute for Health Metrics and Evaluation at the University of Washington School of Medicine: https://bit.ly/1ZSOX7N;

• The National Center for Health Statistics at the Centers for Disease Control and Prevention: https://bit.ly/2XYX1tV.