1. Department of Pediatric Infectious Diseases, Children’s Hospital of Orange County, Orange, California, USA
2. Disease Control and Epidemiology, Orange County Health Care Agency, Santa Ana, California, USA
3. Department of Pediatric Otolaryngology, Children’s Hospital of Orange County, Orange, California, USA
4. University of California, Irvine School of Medicine, Irvine, California, USA
5. Department of Pediatric Radiology, Children’s Hospital of Orange County, Orange, California, USA
6. Department of Surgery, Children’s Hospital of Orange County, Orange, California, USA