Schedules of patient enrolment, study interventions and outcome assessments
| Time point | Enrolment | Randomisation | Interventions | Follow-ups | |
| Within 24 hours postoperatively | From 24 hours postoperatively to discharge | ||||
| Eligibility criteria | · | ||||
| Informed consent | · | ||||
| Physical examination | · | ||||
| Demographic characteristics | · | ||||
| Allocation | · | ||||
| Drug administration | · | ||||
| Procedure | · | ||||
| Primary outcome assessment | · | ||||
| Secondary outcome assessment | · | · | |||