Table 2.

Flowchart of the trial

Time point	After admission	Before surgery	Surgery	After surgery
Informed consent	□
Patients’ background characteristics	□
Physical examination	□
Randomisation		□
Intervention			□
Observation of the surgical site				□a

□a: From postoperative day 1 to postoperative day 30 (outpatient observation is performed at least once if the discharge is within 30 days postoperatively).