Sapra, K., Louis, G. B., Sundaram, R., Joseph, K., Bates, L., Galea, S., & Ananth, C. (2018). Time-Varying Effects of Signs and Symptoms on Pregnancy Loss <20 Weeks: Findings from a Preconception Prospective Cohort Study. Paediatric and Perinatal Epidemiology, 32(1), 30-39. https://doi.org/10.1111/ppe.12402