1. Assistant professor, Department of Pathology, University of Texas Health Sciences Center at Dallas and Medical Examiner, Institute of Forensic Sciences, Dallas, Texas, US.
2. Instructor, Departments of Pathology and Pharmacology, University of Texas Health Sciences Center at Dallas and Chief Toxicologist, Institute of Forensic Sciences, Dallas, Texas, US.
3. Associate professor, Department of Pathology, University of Texas Health Sciences Center at Dallas, Dallas, Texas, US.