Instrument Variable Name: CCH_USM
? [F1] DURING THE PAST 12 MONTHS, did [fill: S.C. name] use chelation therapy?
9 Don't know
UniverseText: Sample children 4+ who have ever used chelation therapy but have never seen a practitioner or have not seen one in the past 12 months
(1,2,R,D) [goto CCS_USE]