Amador Garza and Olga Garza, Individually, and as Next Friends of A.G., a Minor v. Children's Medical Center of Dallas, Igho C. Olobia, M.D., Dane R. Fliedner, M.S., Pedcare, P.A. D/B/A Peditric Clinic of Mesquite and Ernesto A. Nunez, M.D.