1. Hospital Pharmacy Services, Division of Colon and Rectal Surgery, 200 First Street SW, Rochester, Minnesota 55905, USA
2. Department of Nursing, Division of Colon and Rectal Surgery, 200 First Street SW, Rochester, Minnesota 55905, USA
3. Department of Anesthesiology, Division of Colon and Rectal Surgery, 200 First Street SW, Rochester, Minnesota 55905, USA
4. Department of Surgery, Division of Colon and Rectal Surgery, 200 First Street SW, Rochester, Minnesota 55905, USA
5. Biostatistics, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA