Source:http://linkedlifedata.com/resource/umls/id/C0521115
NCI: Occurring or existing at the same time as something else. In medicine, it may refer to a condition a person has or a medication a person is taking that is not being studied in the clinical trial he or she is taking part in.,NCI: Accessory, accompanying especially in a subordinate or incidental way, occurring or existing during the same period of time.