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Baer RJ, McLemore MR, Adler N, Oltman SP, Chambers BD, Kuppermann M, Pantell MS, Rogers EE, Ryckman KK, Sirota M, Rand L, Jelliffe-Pawlowski LL. Pre-pregnancy or first-trimester risk scoring to identify women at high risk of preterm birth. European Journal of Obstetrics & Gynecology and Reproductive Biology. December 2018; 231:235-240.