The etiology and pathogenesis of Henoch-Schönlein purpura is unknown and few studies about familial cases of this disease have been reported. In this study, four Henoch-Schönlein purpura patients coming from two Chinese families were described. No genetic and environmental factors were found to be responsible for the occurrence of the four cases of HSP in tow families in this study.
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Zhang et al. (2008) studied this question.
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