TGM2 and celiac disease: Anti-tTG, Anti-Tissue Transglutaminase; AGA, Anti-Gliadin Antibodies; BG, Basal Ganglia; CD, Celiac Disease; EMA, Endomysial Antibodies; EEG, Electroencephalography; MRI, Magnetic Resonance Imaging; PCC, Posterior Cerebral Calcifications; RLS, Restless Leg Syndrome; TGA, Tissue Transglutaminase antibodies.