preferred_name: No information whatsoever can be inferred from this exceptional value (e.g, patient is not known to be deceased)
preferred_name_lc: no information whatsoever can be inferred from this exceptional value (e.g, patient is not known to be deceased)
label: No information whatsoever can be inferred from this exceptional value (e.g, patient is not known to be deceased)
label_lc: no information whatsoever can be inferred from this exceptional value (e.g, patient is not known to be deceased)