Cite
HARVARD Citation
Strachan, D. et al. (1989). Passive smoking, salivary cotinine concentrations, and middle ear effusion in 7 year old children.. BMJ. 298 (6687), pp. 1549-1552. [Online].
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Strachan, D. et al. (1989). Passive smoking, salivary cotinine concentrations, and middle ear effusion in 7 year old children.. BMJ. 298 (6687), pp. 1549-1552. [Online].