Allin O, Urman RD, Edwards AF, Blitz JD, Pfeifer KJ, Feeley TW, Bader AM. Using Time-Driven Activity-Based Costing to Demonstrate Value in Perioperative Care: Recommendations and Review from the Society for Perioperative Assessment and Quality Improvement (SPAQI). J Med Syst. 2019 Dec 11; 44(1):25.