Almost every day, you hear or read about people working more for less, and doctors are no different with employers, insurers and government payers looking for ways to slow rising health costs. So how do doctors maximize revenue in this challenging environment? Tim Dugan, co-founder of private equity firm Water Street Healthcare Partners, one of the largest such funds focused solely on the health-care industry, tells the Chicago Tribune's Bruce Japsen about private equity and how it works with doctors to improve their revenue.