1 Harry Perkins Institute of Medical Research and the University of Western Australia, 6 Verdun Street, Nedlands 6009, WA, Australia. Electronic address: gina.ravenscroft@uwa.edu.au.
2 APHP, Centre de Référence de Pathologie Neuromusculaire Nord-Est-Ile-de-France, Henri Mondor Hospital, and University Paris-Est, France.