1 Anatomy and Histology Section, Department of Neurological and Movement Sciences, University of Verona , Verona , Italy.
2 Laboratory of Muscle Histopathology and Molecular Biology, IRCCS-Policlinico San Donato , Milan , Italy.
3 Laboratory of Cell Biology and Neurobiology, Department of Biology and Biotechnology, University of Pavia , Pavia , Italy.
4 Laboratory of Muscle Histopathology and Molecular Biology, IRCCS-Policlinico San Donato , Milan , Italy ; Department of Neurology, University of Milan , Milan , Italy.