Hospital spending and length of stay attributable to perioperative adverse events for inpatient hip, knee, and spine surgery: a retrospective cohort study oleh Y. Raja Rampersaud, Kala Sundararajan, Shgufta Docter, Anthony V. Perruccio, Rajiv Gandhi, Diana Adams, Natasha Briggs, J. Rod Davey, Michael Fehlings, Stephen J. Lewis, Rosalie Magtoto, Eric Massicotte, Angela Sarro, Khalid Syed, Nizar N. Mahomed, Christian Veillette