Source:http://linkedlifedata.com/resource/umls/id/C0681876
NCI: A study of a group of individuals taken from the general population who share a common characteristic, such as age, sex, or health condition. This group may be studied for different reasons, such as their response to a drug or risk of getting a disease.,NCI: Multidisciplinary study done at the population level or among the population groups, generally to find the cause, incidence or spread of the disease or to see the response to the treatment, nutrition or environment.