CHRISTUS Point of Light Clinic is located in Dickinson, Texas, a medically-underserved community 30 miles southeast of Houston. Led by family practitioner Sister Ricca Dimalibot, M.D., and family nurse practitioner Elizabeth Ryan, MSN, RN, NP-C, the Clinic opened in 1989 in response to a growing need for healthcare providers in a low-income area between Houston and Galveston..