Blue Cross and Blue Shield is committed since its founding in providing financially sound health care coverage to as many Texans as possible. They serve some of the best known Texas companies, including Brinker International, Brookshire Grocery, the City of Houston, Continental Airlines, the Employees Retirement System of Texas, Halliburton, H.E.B. Grocery, Pilgrim's Pride, the Teacher Retirement System of Texas, the Texas A&M System, Texas Instruments, TXU and The University of Texas System. They are committed to partnering with physicians and hospitals to provide access to affordable, quality health care, and are collaborative partners seeking solutions to joint concerns with employers, physicians, hospitals and governmental bodies. What is more, they also have an Office of Physician Advocacy that is dedicated to addressing network physician concerns and fostering robust communication with the physician community. They also have two Medical Advisory Committees comprised of physicians from across the state that help them ensure credentialing and quality of care standards. In addition, they also provide physicians with an exclusive BlueLink which is an online referral and pre-certification system, which allows physicians to obtain real-time access to network specialist referrals and approval of inpatient and outpatient procedures, 24 hours a day, seven days a week.