1 Neurophthalmology department, Consorci Parc de Salut MAR de Barcelona, C/de Ramon Turró, 337, 08019 Barcelona, Spain. Electronic address: msaint-gerons@psmar.cat.
2 Neuromuscular diseases department, Consorci Parc de Salut MAR de Barcelona, C/de Ramon Turró, 337, 08019 Barcelona, Spain.
3 Neurophthalmology department, Consorci Parc de Salut MAR de Barcelona, C/de Ramon Turró, 337, 08019 Barcelona, Spain.