Landeiro Dos Reis, Virgile, and Aron Culotta. “Using Matched Samples to Estimate the Effects of Exercise on Mental Health via Twitter”. Proceedings of the AAAI Conference on Artificial Intelligence 29, no. 1 (February 9, 2015). Accessed August 16, 2022. https://ojs.aaai.org/index.php/AAAI/article/view/9205.