 This study will be conducted under the supervision of an independent auditor. Every week, the auditor checked the data of the participants the day after the survey was conducted. Assessment of pain intensity and prognostic outcomes must be confirmed by the auditor in sampled population. When there is disagreement between surgeon and anesthesiologists in evaluating the prognosis of patients, the auditor must solve this disagreement by discussion with both evaluators. Data were double-entered by two statisticians with limitation of access and locked during statistical analysis. 