preferred_name: Exposure source in 30 days prior to onset of illness &#x7C; Patient &#x7C; History
preferred_name_lc: exposure source in 30 days prior to onset of illness &#x7c; patient &#x7c; history
label: Exposure source in 30 days prior to onset of illness &#x7C; Patient &#x7C; History
label_lc: exposure source in 30 days prior to onset of illness &#x7c; patient &#x7c; history