1. United Nations Department of Economic and Social Affairs Population Division (2017) World population prospects: the 2017 revision, key findings and advance tables. Working Paper No. ESA/P/WP.248. New York
2. United Nations, Department of Economic and Social Affairs, Population Division (2017). World Population Prospects: The 2017 Revision, Key Findings and Advance Tables. ESA/P/WP/248
3. United Nations Department of Economic and Social Affairs Population Division (2017) World population prospects: volume II: demographic profiles 2017 Revision. New York
4. Ebeling PR (2014) Osteoporosis in men: Why change needs to happen. In: Mitchell PJ (ed) World osteoporosis day thematic report. International Osteoporosis Foundation, Nyon
5. The World Bank (2018) Where we work. http://www.worldbank.org/en/where-we-work. Accessed 20 June 2018