1. National Cancer Institute and Centers for Disease Control and Prevention. Smokeless tobacco and public health: a global perspective. Bethesda: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention and National Institutes of Health, National Cancer Institute. NIH Publication No. 14-7983; 2014.
2. WHO . Adolescents: health risks and solutions. 2016.
http://www.who.int/mediacentre/factsheets/fs345/en/
. Accessed 9 Apr 2017.
3. Agaku IT, Ayo-Yusuf OA, Vardavas CI, Connolly G. Predictors and patterns of cigarette and smokeless tobacco use among adolescents in 32 countries, 2007–2011. J Adolesc Health. 2014;54(1):47–53.
4. WHO. Global Youth Tobacco Survey fact sheets and country reports.
http://www.emro.who.int/tobacco/gtss-youth-survey/gyts-factsheets-reports.html
. Accessed 9 Apr 2017.
5. Ahmed HG. Aetiology of oral cancer in the Sudan. J Oral Maxillofac Res. 2013;4(2):e3.