Any data points that can be used to identify an individual (direct identifiers) or combination of data points that can be used to identify an individual (indirect identifiers). Examples of direct identifiers include name, address, and personal health number. Examples of indirect identifiers include date of birth, gender, and ethnicity. Particularly for small populations, attention must be paid to the combination of indirect identifiers in a database. For example, date of birth is identifying information within a small population.