Feeling the pressure of a weakened economy, nonprofit Resurrection Health Care is selling two of its Illinois hospitals to a Tennessee-based for-profit company. Resurrection said Tuesday that it will transfer Westlake Hospital in Melrose Park and West Suburban Medical Center in Oak Park to Vanguard Health Systems, which operates 15 hospitals across the country, including two in the Chicago area. Financial terms of the deal, expected to close by midyear 2010, were not disclosed.