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Flow-chart presenting the effect of tap test (subtractive lumbar punctures) and shunt on gait in patients in the iNPH-bv-FTLD and iNPH groups. The effect on gait was assessed 3 months after shunt surgery. LP, lumbar puncture; ALS, amyotrophic lateral sclerosis; VPS, ventriculoperitoneal shunt; VAS, ventriculoatrial shunt
