Lumbar puncture, Brain scan, Blood sample collection, Autoimmune encephalitis, Neuromyelitis optica, Myelin oligodendro...cyte glycoprotein antibody-associated disease, Autoimmune neurological disorder, Paraneoplastic syndromes of the nervous system, Encephalitis, Neuromyotonia, Stiff person syndrome, Autoimmune epilepsy, Autoimmune dementia, Paraneoplastic encephalitis