1. World Health Organization (WHO): Obesity and Overweight—Fact Sheet No. 311. http://www.who.int/mediacentre/factsheets/fs311/en/index.html
2. Carmo, I., Santos, O., Camolas, J., Vieira, J., Carreira, M., Medina, L., Reis, L., Myatt, J., Galvão-Teles, A.: National prevalence of obesity—overweight and obesity in Portugal: national prevalence in 2003–2005. Obes. Rev. 9(1), 11–19 (2008)
3. Flegal, K., Carroll, M., Ogden, C., Johnson, C.: Prevalence and trends in obesity among US adults, 1999–2000. JAMA 288(14), 1723–1727 (2002)
4. Tsai, S., Ashmed, F., Wendt, J., Bhojani, F., Donnelly, R.: The impact of obesity on illness absence and productivity in an industrial population of petrochemical workers. Ann. Epidemiol. 18(1), 8–14 (2008)
5. Lier, H., Biringer, E., Eriksen, H., Tangen, T.: Subjective health complaints in a sample with morbid obesity and the complaints’ relation with work ability. Eur. Psychiatry 24(S1), 750 (2009)