1. Department of Emergency Medicine Division of Pediatric Emergency Medicine Columbia University College of Physicians and Surgeons New York New York USA
2. Department of Biostatistics Mailman School of Public Health Columbia University New York New York USA
3. Departments of Pediatrics and Neurology Sidney Kimmel Medical College of Thomas Jefferson University Morristown New Jersey USA
4. Department of Emergency Medicine Albert Einstein College of Medicine Montefiore Medical Center Bronx New York USA