Instrument Variable Name: CHE_IMM
*Read if necessary.
DURING THE PAST 12 MONTHS, did you use chelation therapy for any of these reasons?
...To improve or enhance immune function
9 Don't know
Universe Text: Sample adults 18+ who have seen a practitioner for chelation therapy in past 12 months
(1,2,D,R) [goto CHE_NOHP]