title: Response.
authors.affiliation: Centre Mère-Enfant Soleil, Quebec City, Canada. Electronic address: nicolas.chrestian.1@ulaval.ca.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Chrestian
authors.affiliation: Faculty of Medicine, Division of Neurology, Department of Pediatrics, University of Toronto; Neuromuscular Program and Electrodiagnostic Medicine, The Hospital for Sick Children. Electronic address: jiri.vajsar@sickkids.ca.
authors.forename: Jiri
authors.initials: J
authors.lastname: Vajsar