Kakkar, M., R. Kakkar, A. Lal, and S. Singla. “Effect of Age, Sex and Pregnancy on Levels of Urinary Inhibitors of Mineralization in Human Beings”. Nepal Journal of Epidemiology, vol. 4, no. 4, Sept. 2014, pp. 399-04, doi:10.3126/nje.v4i4.11360.