1. 1. World Health Organization. 2011. Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity Accessed August 4, 2017 http://www.who.int/vmnis/indicators/haemoglobin.pdf.
2. 2. World Health Organization. Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. Vitamin and Mineral Nutrition Information System. (2011).Available from www.who.int/ vmnis/indicators/haemoglobin/en/. 9-2-2018.
3. 3. World Health Organization. The global prevalence of anaemia in 2011. Geneva: World Health Organization; 2015.
4. 4. R. Toheed, T. B. Ayub, H. S. Ali, S. Mumtaz, and A. Haneef, “Prevalence of anemia and its main determinants among primigravidae in antenatal population of a tertiary care hospital of lahore,” P J M H S, vol. 9, no. 3, p. 907, 2015.
5. 5. Davidson’s Principles and Practice of Medicine. 22nd ed. Edinburgh, Scotland: Churchill Livingstone/Elsevier; 2014.