Baseline characteristics of subjects.
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Ab Antibody titer. *Nicotine replacement therapy users and subjects with missing titers at months 4 to 6 were excluded; the participants on active treatment were separated into three responder subgroups according to their antibody titers: high, medium, and low antibody titer levels. **Median values (25% ; 75% quartiles).
创建时间：
2008-06-25
