Shantell Keller of Georgetown is one of nearly 6.2 million Texans navigating through tough times without health insurance. For years, she and her husband have left their health problems untreated. Last month, she started going to Lone Star Circle of Care, a federally qualified health center that serves underinsured and underserved patients. Keller and her husband pay their fees on a sliding scale. For the first time, they can receive primary care, a first step toward becoming healthier and more productive.