preferred_name: No information whatsoever can be inferred from this exceptional value (e.g, unknown if patient was an inpatient).
preferred_name_lc: no information whatsoever can be inferred from this exceptional value (e.g, unknown if patient was an inpatient).
label: No information whatsoever can be inferred from this exceptional value (e.g, unknown if patient was an inpatient).
label_lc: no information whatsoever can be inferred from this exceptional value (e.g, unknown if patient was an inpatient).