Frequency-risk relationships between second-hand smoke exposure and respiratory symptoms among adolescents: a cross-sectional study in South China
| Publication Date: |
2018-04-04
|
|---|---|
| Publisher: |
BMJ Publishing
|
| Electronic ISSN: |
2044-6055
|
| Topics: |
Medicine
|
| Keywords: |
Open access, Smoking and tobacco
|
| Published by: |