1. Division of Gastrointestinal Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
2. Department of Anesthesiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
3. Division of Preventative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
4. Department of Medicine, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
5. Department of Pediatrics, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA