Randomization and masking
RECRUITMENT
A computer-generated sequence was used to randomize participants using an allocation ratio of 1 : 1. Randomization was stratified according to recruitment site only, and treatment group numbers were balanced using sequences of random permuted blocks of sizes 2 and 4. Randomization was undertaken by a member of the research team once the participant had reached the operating theatre. Neither the surgeons nor participants could be masked. The cosmetic outcome assessment was performed by masked independent researchers.