1. An Aging World. Database Research Report issued June 2009 by National Institute of Aging, US National Institutes of Health, US Department of Health and Human Services; 2008. [Internet]. Available on: http://www.nia.nih.gov/ResearchInformation/ExtramuralPrograms/BehavioralAndSocialResearch/an-aging-world.htm and http://www.nia.nih.gov/NR/rdonlyres/FBC46426-ABF5-40F7-A0EF-C6A178B0B478/0/AgingWorld2008.pdf . Accessed 10/08/2010.
2. National Commission on Population, Government of India website [Internet]. Available on: http://populationcommission.nic.in/facts1.htm . Accessed 10/08/2010.
3. Unger F. The changing image in cardiac surgery. J Cardiovasc Surg. 1994;35:1–5.
4. Nissinen J, Wistbacka JO, Loponen P, et al. Coronary artery bypass surgery in octogenarians: long-term outcome can be better than expected. Ann Thorac Surg. 2010;89:1119–24.
5. Avery II GJ, Ley SJ, Hill JD, Hershon JJ, Dick SE. Cardiac surgery in the octogenarian: evaluation of risk, cost, and outcome. Ann Thorac Surg. 2001;71:591–6.