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Baer RJ, Lessard LN, Jankowska M, Anderson JG, Block J, Chambers CD, Fuchs J, Kuppermann M, McLemore MR, Newel G, Oltman SP, Rogers EE, Ryckman KK, Steurer MA, Yang J-A, Franck LS, Rand L, Jelliffe-Pawlowski LL. Comparison of risk and protective factors for preterm birth in rural, suburban, and urban Fresno County, California. Journal of Epidemiological Research. August 2018; 4(2):50-58.