the two groups were determined to be homogeneous as to age , breast size , weight , height , obesity , previous biopsy , excision of pectoralis minor , excision of thoracodorsal complex , level of axillary dissection , total number of lymph nodes , number of positive lymph nodes , lymphatic vessel invasion ( with negative lymph nodes ) , and whether the dominant hand was on the side operated on .
C0193867
axillary dissection
C0024204
lymph nodes