Rare diseases (RDs) are a group of disorders of very different etiology, whose common denominator is that they are low-prevalence diseases and for most of which there is no treatment available. Because of their low prevalence, they attract little interest from basic and clinical researchers and the scientific community in general, all of whom find it very difficult to secure public and/or private sources of financing for the study of the pathogenesis, diagnosis, and treatment of such diseases

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