1. Fisher EB, Brownson RC, Luke DA, Sumner WI, Heath AC. Cigarette smoking. In: Raczynski J, Bradley L, Leviton L, editors. Health behavior handbook. Washington, DC: American Psychological Association; 2004.
2. Brownell KD, Horgen KB. Food fight: the inside story of the food industry, America’s obesity crisis, and what we can do about it. New York: McGraw-Hill; 2004.
3. Marmot MG, McDowall ME. Mortality decline and widening social inequalities. Lancet. 1986;2:274–6.
4. Per capita GDP at current prices - US dollars. http://data.un.org/Data.aspxq=GDP+per+capita&d=SNAAMA&f=grID%3a101%3bcurrID%3aUSD%3bpcFlag%3a1. Accessed 29 April 2018.
5. Marmot M. Social determinants of health inequalities. Lancet. 2005;365:1099–104.