Determination of maternal risk factors of preterm delivery: adjusted for sparse data bias; results from a population-based case-control study in Iran

by Mehrdad Valipour, Erfan Ayubi, Narges Shiravand, Yousef Moradi, Abolfazl Abbaszadeh, Firooz Amrai, Shahin Mokhtari, Kaveh Bahmanpour, Kamyar Mansori
Published 2020-03-01