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Valipour, M. and Ayubi, E. and Shiravand, N. and Moradi, Y. and Abbaszadeh, A. and Amrai, F. and Mokhtari, S. and Bahmanpour, K. and Mansori, K. (2020) Determination of maternal risk factors of preterm delivery: Adjusted for sparse data bias; results from a population-based case-control study in Iran. Obstetrics and Gynecology Science, 63 (2). pp. 117-125.