1. Division of Pediatric Surgery, Children’s Hospital Los Angeles, 4650 Sunset Blvd., Mailstop #175, Los Angeles, CA 90027, USA
2. Las Madrinas Simulation Research Laboratory, Children’s Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA 90027, USA
3. Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, AL 35294, USA
4. Division of Emergency and Transport Medicine, Children’s Hospital Los Angeles, Los Angeles, CA 90027, USA