Comparison of risk and protective factors for preterm birth in rural, suburban, and urban Fresno County, California

Baer RJ, Lessard L, 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, Franck LS, Rand L, Jelliffe-Pawlowski LL