Not to mention

The city was already having staffing difficulties, not to mention having a three million dollar budget shortfall.

In fact, the immortal tunemeister Irving Berlin wrote all three [songs], along with about 1,500 others, not to mention the scores for eighteen Hollywood films and nineteen Broadway musicals.

An artificial kidney these days still means a refrigerator-sized dialysis machine. Such devices mimic[…]real kidneys[…]. But they are nothing like as efficient, and can cause bleeding, clotting and infection—not to mention inconvenience for patients, who typically need to be hooked up to one three times a week for hours at a time.