P 233. Thiamine Pyrophosphokinase Deficiency due to Mutations in the TPK1 Gene: A Rare, Treatable Neurodegenerative Disorder - Rüsch, Christina; Wortmann, Saskia B.; Kovacs-Nagy, Reka; Grehten, Patrice; Häberle, Johannes; Latal, Bea; Stettner, Georg (Neuropediatrics, 2018)