Núñez-de la Mora, A., Chatterton, R. T., Mateo, E. T., Jesmin, F., & Bentley, G. R. (2007). The effect of chewing betel nut on measurements of salivary progesterone and estradiol. American Journal of Physical Anthropology, 132(2), 311-315. https://doi.org/10.1002/ajpa.20513