Final answer:
A trauma registrar can find cases to include through various sources such as maps of trauma centers, medical records, and epidemiological interviews with patients.
Step-by-step explanation:
A trauma registrar can find cases to include through various sources. One option is to consult a map of trauma centers in their area, provided by organizations like the American Trauma Society. This map can help identify trauma centers where relevant cases may be found.
Another option is to review medical records and identify cases that meet the criteria for inclusion. Trauma registrars can work with healthcare institutions to access these records and gather the necessary information.
In some cases, epidemiologists may conduct interviews with a randomly selected sample of patients to gather data. Trauma registrars can collaborate with these professionals and obtain relevant cases from their findings.