1. Department of Anesthesiology and Pain Medicine; UC Davis Medical Center; Sacramento; CA; USA
2. Pain & Policy Studies Group, Paul P. Carbone Comprehensive Cancer Center; University of Wisconsin School of Medicine and Public Health; Madison; WI; USA
3. Clinical and Translational Science Center (CTSC); UC Davis Health System; Sacramento; CA; USA
4. Department of Statistics; University of California, Davis; Davis; CA; USA
5. Department of Public Health Sciences, Division of Biostatistics; University of California, Davis; Davis; CA; USA