1. Department of Psychology; University of Gothenburg; Gothenburg Sweden
2. Neuromuscular Centre; Department of Neurology; Sahlgrenska University Hospital; Gothenburg Sweden
3. Department of Clinical Genetics; Sahlgrenska University Hospital; Gothenburg Sweden
4. Department of Biomedical Sciences for Health; IRCCS Policlinico San Donato; University of Milan; San Donato Milanese Italy