1. Department of Surgery, Loma Linda University and Loma Linda University Children's Hospital, Loma Linda, California.
2. Department of Communicative Disorders, East Tennessee State University, Johnson City, Tennessee.
3. East Tennessee State University, Johnson City, Tennessee.
4. Division of Biometry and Medical Computing, East Tennessee State University, Johnson City, Tennessee.
5. Department of Pediatrics, Loma Linda University, Loma Linda, California.