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Encrusted catheters from 10 female patients were the source of 26 samples of deposits which were examined by X-ray diffraction. Four different types of catheter were represented. The only detectable compound in all of the samples was ammonium magnesium orthophosphate hexahydrate (NH4MgPO4 . 6H2O), which occurs naturally as the mineral struvite.
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Hukins et al. (1983) studied this question.
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