Boltunova, MD, A.; White, MD, MS, R. S.; Noori, MD, S.; Chen, BA, S. A.; Gaber-Baylis, BA, L. K.; Weinberg, MD, R. Pre-Existing Opioid Use Disorder and Postoperative Outcomes After Appendectomy or Cholecystectomy: A Multi-State Analysis, 2007-2014. J of Opioid Management 2019, 15, 235-251.