Randomization
breast cancer
BREAST CANCER
The unit admitting breast cancer was divided into four medical groups, the staffs were adequately trained, and the surgeries were performed in a homogeneous manner. As each medical group managed a fixed number of patients and wards, patients in different medical groups were treated in other wards. To avoid contamination between the intervention and control groups, the study was conducted in regional randomized groups based on departmental medical groups. Four labels were placed in four opaque envelopes, two with 0 and the other with 1. Four physicians representing their respective groups drew the envelopes, and patients enrolled in the two medical groups with “0” were designated as the control group and the other two groups as the intervention group.