Pandya, M. J., Kotdawala, P. J., & M. Pandya, J. (2017). Study of duration of gestation in 500 patients with spontaneous onset of labor. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 6(12), 5469–5471. https://doi.org/10.18203/2320-1770.ijrcog20175262