preferred_name: Date of skin test &#x7C; Skin &#x7C; Skin challenge
preferred_name_lc: date of skin test &#x7c; skin &#x7c; skin challenge
label: Date of skin test &#x7C; Skin &#x7C; Skin challenge
label_lc: date of skin test &#x7c; skin &#x7c; skin challenge