Portable HEPA filter air cleaner use during pregnancy and children’s behavior problem scores: a secondary analysis of the UGAAR randomized controlled trial - Enkhbat, Undarmaa; Gombojav, Enkhjargal; Banzrai, Chimeglkham; Batsukh, Sarangerel; Boldbaatar, Buyantushig; Enkhtuya, Enkhtuul; Ochir, Chimedsuren; Bellinger, David C.; Lanphear, Bruce P.; McCandless, Lawrence C.; Allen, Ryan W. (Environmental Health, 2021)