1. Department of Family Practice, University of Texas Health Science Center at San Antonio and El Centro Del Barrio Community Health Clinic, San Antonio, Texas.
2. Department of Pediatrics, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
3. Trinity Medical Group, San Antonio, Texas.
4. Department of Family Practice, University of Monterrey, Monterrey, Knave Leon, Mexico.
5. University of Texas Family Medical Center, McAllen, Texas.