1. Department of Anesthesiology Vanderbilt University Medical Center Nashville TN USA
2. Centro Quirurgico Pediatrico Moore Guatemala City Guatemala
3. Pathology Department St. Jude Children's Research Hospital Memphis TN USA
4. Department of Anesthesiology and Critical Care Medicine Johns Hopkins University School of Medicine Baltimore MD USA
5. Vanderbilt Institute for Global Health Vanderbilt University Medical Center Nashville TN USA