Assertion: urinary bladder | /r/HasProperty | described by kempton et al
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Source sentences:
text: Cohen et al.  also stated that primary extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT type) of the urinary bladder, which was first described by Kempton et al.  in 1990, is the most common primary bladder lymphoma and is associated with an excellent prognosis.