Papageorghiou, A. T., Ohuma, E. O., Gravett, M. G., Hirst, J., da Silveira, M. F., Lambert, A., Carvalho, M., Jaffer, Y. A., Altman, D. G., Noble, J. A., Bertino, E., Purwar, M., Pang, R., Ismail, L. C., Victora, C., Bhutta, Z. A., Kennedy, S. H., & Villar, J. (2017). international Standards for Symphysis-Fundal Height Based on Serial Measurements From the Fetal Growth Longitudinal Study of the INTERGROWTH-21st Project. Obstetrical & gynecological survey, 72(3), . http://access.bl.uk/ark:/81055/vdc_100048893949.0x000025