1. Graduate School of Public Health, San Diego State University, San Diego, United States of America (USA).
2. School of Nursing, University of California San Francisco, San Francisco, USA.
3. Maxwell School Citizenship and Public Affairs, Syracuse, New York, USA.
4. The Cigarette Butt Pollution Project, Washington, USA.
5. Secretariat for the WHO Framework Convention on Tobacco Control, Geneva, Switzerland.
6. Simon Fraser University, Vancouver, Canada.
7. Tobacco Free Initiative, World Health Organization, avenue Appia 20, 1211 Geneva 27, Switzerland.