Recruitment, randomisation and masking
Patients were recruited from three local Centres of Excellence for Bariatric Surgery. Potential candidates were approached by phone and informed about the study. After provision of written informed consent, participants underwent a detailed eligibility screening and a baseline assessment of study outcomes. Thereafter, participants were randomised to the IG or CG. First, pairs of participants were created using non-bipartite matching according to age, sex, current BMI, and time since surgery. For each pair, one participant was randomly assigned to each group. The randomisation was performed using the software R (version 3.6.3) and the software package 