1 Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Canadian Centre for Human Microbiome and Probiotics Research, Lawson Health Research Institute, London, Ontario, Canada; Department of Surgery, Western University, London, Ontario, Canada. Electronic address: jeremy.burton@lawsonresearch.com.
2 Department of Neurosurgery, Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 165, 8200 Aarhus N, Denmark; Center for Experimental Neuroscience-CENSE, Department of Neurosurgery, Aarhus University Hospital, Palle Juul-Jensens Boulevard 165, 8200 Aarhus, N, Denmark; Biological Sciences, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON, Canada. Electronic address: rhko@clin.au.dk.
3 Institute for Regenerative Medicine, University of Zurich, Schlieren, Switzerland; Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland; Department of Physiology and Neuroscience, University of Southern California, Los Angeles, CA 90089, USA; Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, 1501 San Pablo St., Los Angeles, CA 90089, USA. Electronic address: rrust@usc.edu.