Normally, after this surgery, skin is stitched in the usual simple way, with no quilting, and two drains are put in to remove serosa, one under the arm and one on the chest. In this study, the investigator will use a different type of stitch called a quilting stitch, which helps stick the skin to the chest muscle so there is less serosa collection. The investigator will compare two groups:
* Group A: Quilting stitches with two drains (one under the arm and one on the chest).
* Group B: Quilting stitches with one drain only (under the arm).