1. Section of Neurosurgery, Dartmouth‐Hitchcock Medical Center, Lebanon, NH
2. Department of Neurosurgery, Louisiana State University Health Sciences Center, Shreveport, LA
3. Geisel School of Medicine at Dartmouth, Hanover, NH
4. Department of Medicine, Dartmouth‐Hitchcock Medical Center, Lebanon, NH
5. Department of Community and Family Medicine, Dartmouth‐Hitchcock Medical Center, Lebanon, NH
6. The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, NH