“…For some diseases, this is a setback due to their relative frequency, which can affect the calculation of a precise combined incidence; such is the case for MPS II, MPS III A, MPS IV A, Krabbe disease, and NiemannPick C disease. If these enzyme defects would have been assayed, and considering the average prevalence/incidence reported by other authors, our combined incidence would approach 8.0/100,000, which is very similar to that reported in British Columbia (Applegarth et al, 2000), but still lower than the rest of the epidemiological studies (Krasnopolskaya et al, 1993;Meikle et al, 1999;Poorthuis et al, 1999;Pinto et al, 2004;Poupetová et al, 2010). Another is the case for neuronal ceroid lipofuscinoses (NCL), for which relatively high prevalences have been reported in Portugal, Czech Republic and Finland (2.14, 2.29 and 12.5 per 100,000, respectively ;Santavuori, 1988;Pinto et al, 2004;Poupetová et al, 2010).…”