1. School of Medicine, Xochicalco University, Tijuana, Mexico
2. Department of Pediatric Infectious Disease, Tijuana General Hospital, Tijuana, Baja California, Mexico
3. Department of Pediatrics, University of California San Diego, San Diego, CA, USA
4. Division of Infectious Diseases, University of California San Diego, Rady Children’s Hospital of San Diego, San Diego, CA, USA