Overall Cost Comparison of Gastrointestinal Endoscopic Procedures With Endoscopist- or Anesthesia-Supported Sedation by Activity-Based Costing Techniques oleh Richard A. Helmers, MD, James A. Dilling, MBA/HCM, Christopher R. Chaffee, MBA, Mark V. Larson, MD, Bradly J. Narr, MD, Derek A. Haas, MBA, Robert S. Kaplan, PhD