Impact of Crew Resource Management Training to Improve the Effectiveness of Surgical Safety Checklist (IDILIC)

* Assistance by a local caregiver investigator (i.e., surgeon, anaesthetist, nurse,...) responsible for the implementation of surgical safety checklist within the operatory rooms of his department ; * A two-step CRM training of surgical teams (i.e., surgeons, anaesthetists, nurses,...) conducted by advisors from the world of air company using video support: * First month following randomization: a course about the implementation of surgical safety checklist (using online-available WHO short movies and other videos of surgical teams) and core concepts of CRM adapted to the operating room; * Sixth month following randomization: a feedback to surgical teams aiming at identifying and solving barriers related to the checklist implementation and interpersonal communication * Written reminders including the systematic presence of an unfilled surgical safety checklist in the patient's medical report, stickers and wall posters in operatory rooms