1 Department of Neurology, Hospital de Egas Moniz, Centro Hospitalar de Lisboa Ocidental, Lisboa, Portugal; CEDOC, Chronic Diseases Research Center, NOVA Medical School, Lisboa, Portugal. Electronic address: paulobugalho@sapo.pt.
2 Department of Neurology, Hospital de Egas Moniz, Centro Hospitalar de Lisboa Ocidental, Lisboa, Portugal; CEDOC, Chronic Diseases Research Center, NOVA Medical School, Lisboa, Portugal. Electronic address: marcelomendoncasousa@gmail.com.