Placental toxic metal concentrations and preterm birth: Modification by social stressors - Ruohan Liao; Adriana C. Vidal; James Harrington; John Thorp; David Skaar; Yukun Liu; Susan K. Murphy; David W. Sosnowski; Sara B. Johnson; Gang Peng; Jung-Ying Tzeng; Cathrine Hoyo (Reproductive Toxicology, 2026)