https://www.selleckchem.com/pr....oducts/PHA-739358(Da
Orphan (rare) diseases include congenital or acquired diseases, the frequency of occurrence of which does not exceed a certain number established by the laws of various countries. Despite its rarity, the orphan diseases make a significant contribution to the structure of population disability and most of them have no specific treatment. One of the main clinical challenges in these patients is to ensure their high quality of life (QOL). The review describes basic non-specific and specific questionnaires for assessing QOL i