1. Division of Neuropediatrics and Muscular Disorders, Department of Pediatrics and Adolescent Medicine, University Medical Center and Medical Faculty University of Freiburg Freiburg Germany
2. Present (private) address: Gutleutstr. 21, 79115 Freiburg Germany
3. Division of High‐Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases U.S. Centers for Disease Control and Prevention Atlanta Georgia USA