1 Department of Surgery, VA North Texas Health Care System, Dallas, TX; Hospital Nacional de San Benito, El Peten, Guatemala. Electronic address: Sergio.Huerta@UTSouthwestern.edu.
2 Federico Gomez Children's Hospital of Mexico, Mexico City, Mexico; Faculty of Medicine, Autonomous University of Yucatan, Merida, Yucatan, Mexico.
3 Texas A&M University, College Station, TX.
4 Hospital Nacional de San Benito, El Peten, Guatemala.