Rosenberg, R. E., Ahmed, A. N. U., Ahmed, S., Saha, S. K., Chowdhury, M. A., Black, R. E., Santosham, M. and Darmstadt, G. L. (2009) “Determining Gestational Age in a Low-resource Setting: Validity of Last Menstrual Period”, Journal of Health, Population and Nutrition, 27(3), pp. 332–338. doi: 10.3329/jhpn.v27i3.3375.