| http://www.w3.org/ns/prov#value | - Furthermore, there was a difference in the administered dose (150???mg versus 50???mg) of urea and the time interval (60???min versus 30???min) until the reading of the UBT. Another difference between the studies is that the referred one concerns patients, whereas the present one concerns a population-based cohort.In a study from 2009 by Calvet et al. including 118 patients and using a predefined
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