GRM1 and neuromyelitis optica: The rest of the encephalitis panel, including anti-glutamic acid decarboxylase (anti-GAD), aquaporin-4 receptor (NMO/AQP4), dipeptidyl-peptidase-like protein 6 (DPPX), α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR), contactin-associated protein-2 (CASPR2), gamma-aminobutyric acid receptor type A (GABA-AR), gamma-aminobutyric acid receptor type B (GABA-BR), leucine-rich glioma-inactivated protein 1 (LGI1), metabotropic glutamate receptor 1 (mGluR1), and IgLON family member 5 (IgLON5) antibodies, were negative.