1. Syrian Center for Tobacco Studies; Aleppo Syrian Arab Republic
2. Department of Public Health Sciences; University of Miami Miller School of Medicine; Miami Florida USA
3. Nuffield Department of Primary Care Health Sciences; University of Oxford; Oxford UK
4. School of Public Health; University of Memphis; Memphis Tennessee USA
5. Department of Psychology and Center for the Study of Tobacco Products; Virginia Commonwealth University; Richmond Virginia USA
6. Biostatistics; Florida International University; Miami FL USA
7. Department of Epidemiology, Robert Stempel College of Public Health and Social Work; Florida International University; Miami Florida USA