preferred_name: Grade 3: severe signs of ischemia (e.g., ABI <0.39, ankle SBP <50 mm Hg, or toe pressure <30 mm Hg)
preferred_name_lc: grade 3: severe signs of ischemia (e.g., abi <0.39, ankle sbp <50 mm hg, or toe pressure <30 mm hg)
label: Grade 3: severe signs of ischemia (e.g., ABI <0.39, ankle SBP <50 mm Hg, or toe pressure <30 mm Hg)
label_lc: grade 3: severe signs of ischemia (e.g., abi <0.39, ankle sbp <50 mm hg, or toe pressure <30 mm hg)