instruction: find the number of patients with other septicemia due to gram-negative organisms diagnoses who had urine urea nitrogen lab test.
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.short_title = "Gram-neg septicemia NEC" AND lab.label = "Urea Nitrogen, Urine"