SSBP1 and retinal dystrophy, optic nerve edema, splenomegaly, anhidrosis, and migraine headache syndrome: The value of comprehensive electrophysiological phenotyping in syndromic diseases is highlighted in cases of SSBP1-related disease and ROSAH (Retinal dystrophy, Optic nerve oedema, Splenomegaly, Anhidrosis and Headache).