preferred_name: Cardiac problems (e.g., fluid overload, exacerbation of CHF, chest pain)
preferred_name_lc: cardiac problems (e.g., fluid overload, exacerbation of chf, chest pain)
label: Cardiac problems (e.g., fluid overload, exacerbation of CHF, chest pain)
label_lc: cardiac problems (e.g., fluid overload, exacerbation of chf, chest pain)