A storefront clinic operated by the University of Chicago Medical Center will close at the end of June, marking another significant step in the facility's groundbreaking, and controversial, plan to pull back on some of the medical services it provides directly to the poor and indigent. Medical center executives say the steep downturn in the economy has forced them to trim $100 million from the hospital's budget to maintain their role of running a world-class hospital, research center, and medical school. The Women's Health Center, which cares for thousands of Medicaid patients, is a money loser, the officials said.