1. Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
2. National Prion Disease Pathology Surveillance Center, Case Western Reserve University, Cleveland, OH 44106, USA
3. Department of Epidemiology & Biostatistics, Case Western Reserve University, Cleveland, OH 44106, USA
4. Department of Neurology, Case Western Reserve University, Cleveland, OH 44106, USA
5. National Center for Regenerative Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
6. State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China