@article{Chossis_2006, title={Secular trends in legal and illegal substance use among 16 to 20 year old adolescents in Switzerland}, volume={136}, url={https://smw.ch/index.php/smw/article/view/607}, DOI={10.4414/smw.2006.11366}, number={1920}, journal={Swiss Medical Weekly}, author={Chossis, I}, year={2006}, month={May}, pages={318–318} }