preferred_name: Date of other vaccinations given within 4 weeks prior to the date of vaccine causing adverse event
preferred_name_lc: date of other vaccinations given within 4 weeks prior to the date of vaccine causing adverse event
label: Date of other vaccinations given within 4 weeks prior to the date of vaccine causing adverse event
label_lc: date of other vaccinations given within 4 weeks prior to the date of vaccine causing adverse event