1. Department of Neurological Surgery, University of California, San Francisco
2. Philip R. Lee Institute for Health Policy Studies, University of California, San Francisco
3. Department of Anesthesiology, Medical College of Wisconsin, Milwaukee
4. Advancing a Healthier Wisconsin Endowment, Milwaukee
5. Division of Hospital Medicine, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland
6. American Enterprise Institute, Washington, DC