Randomization
BLIND
The block randomization method for the clinical study was designed to randomize subjects into 1 of the possible groups, i.e. group I: general anesthesia, group II: SAM + PECS-1 block. After generation of the randomization codes by the corresponding author, the allocation was registered in opaque sealed envelopes, and the patients were kept blind to this process. An anesthesiologist recruited participants from the ambulatory care unit of Hospital Sirio-Libanes.