preferred_name: No information whatsoever can be inferred from this exceptional value. (e.g., unknown if the diagnosis was initially based on ambiguous terminology).
preferred_name_lc: no information whatsoever can be inferred from this exceptional value. (e.g., unknown if the diagnosis was initially based on ambiguous terminology).
label: No information whatsoever can be inferred from this exceptional value. (e.g., unknown if the diagnosis was initially based on ambiguous terminology).
label_lc: no information whatsoever can be inferred from this exceptional value. (e.g., unknown if the diagnosis was initially based on ambiguous terminology).