GAD2 and autoimmune encephalitis: Fifteen of 19 patients met definite AE criteria on the basis of possible autoimmune encephalitis (presence of altered mental status, short‐term memory loss, or psychiatric symptoms in addition to brainstem symptomatology) and neural antibody positivity (GAD65, 5 patients [GAD65 and glycine receptor IgG 1 patient]; IgLON5, 4 patients; Ma2, 2 patients; KLHL‐11, 2 patients; ANNA1, DPPX, 1 patient each).