tokens: STUDY DESIGN : Salivary immunoglobulin A levels of each of 20 subjects were determined on 3 occasions : first , while the subject was still smoking ; second , 7 days after cessation of smoking ; third , on the 14th day after cessation .
folded_tokens: study design : salivary immunoglobulin a level of each of 20 subject be determine on 3 occasion : first , while the subject be still smoking ; second , 7 day after cessation of smoking ; third , on the 14th day after cessation .