All participants provided written, informed consent on each occasion
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acetaldehyde, crotonaldehyde volatile hydrocarbons benzene, toluene aromatic amines trace materials as well as carbon monoxide, nitric oxide, acrolein and phenol
Froum, a diplomate of the American Board of Periodontology, is a volunteer professor in the postgraduate periodontal program at SUNY Stony Brook School of Dental Medicine
Results Sample In total, there were 1,625 smoker participants who lived in Beijing (n = 545), Shanghai (n = 541) and Shenzhen (n = 539) (Table 1)