1. Education Program, Division of Pain Medicine, Department of Anesthesiology and Pain Medicine, School of Medicine, University of California, Davis, Sacramento, California
2. Department of Anesthesiology and Pain Medicine, School of Medicine, University of California, Davis, Sacramento, California
3. Department of Anesthesiology, Sacramento VA Medical Center, VA Northern California Healthcare System, Mather, California
4. UC Davis Cancer Pain Management and Supportive Care, Division of Pain Medicine, Department of Anesthesiology and Pain Medicine, School of Medicine, University of California, Davis, Sacramento, California
5. Division of Pain Medicine, Department of Anesthesiology and Pain Medicine, School of Medicine, University of California, Davis, Sacramento, California
6. Division of Biostatistics, Department of Public Health Sciences, School of Medicine, University of California, Davis, Sacramento, California
7. Division of Pain Medicine, Department of Anesthesiology and Pain Medicine, Center for Advancing Pain Relief, School of Medicine, University of California, Davis, Sacramento, California, USA