[1] Wellcome Trust Ctr Human Genet, Oxford, England
[2] Natl Res Council, Inst Expt Med & Biotechnol, Cosenza, Italy
[3] Hop La Pitie Salpetriere, Paris, France
[4] King Saud Univ, Dept Pediat, Riyadh, Saudi Arabia
[5] Cyprus Inst Neurol & Genet, Mol Genet Unit D, Nicosia, Cyprus
[6] Polish Acad Sci, MRC, Neuromuscular Unit, Warsaw, Poland
[7] Univ Genoa, Dipartimento Sci Neurol & Riabilitaz, Genoa, Italy
[8] Univ Genoa, Dipartimento Oncol Biol & Genet, Genoa, Italy
[9] Univ Catanzaro, Inst Neurol, Catanzaro, Italy