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Abstract. A series of 53 Portuguese patients (derived from 43 families) born in the period 19631999 have been diagnosed with neuronal ceroid lipofuscinosis (NCL) based on clinicopathological findings. Plotting the cumulative number of new cases per year against the year of birth resulted in a slightly S-shaped curve, with a nearly straight central segment over a period of 14 years (19771990) indicating...