Directions from either north or south bound on east loop 820. Exit hwy 10 and turn west on West Hurst Blvd (HWY 10) then turn right (north) on Booth Calloway RD and then turn right (east) on Encino Dr. and right on the service road for Loop 820. Clinic is on the corner of Encino Dr. and the service road for Loop 820. A gray two story office building, Suite #100 the offices of Dr. Wright Singleton MD PA. Doctors office providing the Protocol treatment for DFW Stop Smoking Clinics LLC.