1. Center for Infection and Immunity, Mailman School of Public Health, Columbia University, New York, New York, USA
2. Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Department of Pediatrics, University of California San Diego School of Medicine, La Jolla, California, USA
4. Division of Critical Care and Hospitalist Neurology, Department of Neurology, Columbia Irving University Medical Center, New York, New York, USA