Campbell, M. L. H., Peachey, L. E., Wathes, D. C., & De Mestre, A. M. Expression of Oestrogen Receptor a Is Negatively Correlated With Collagen Density in the Mare’s Cervix. Journal of Equine Veterinary Science, 66, 100. https://doi.org/10.1016/j.jevs.2018.05.150