The effect of portable HEPA filter air cleaner use during pregnancy on fetal growth: The UGAAR randomized controlled trial oleh Prabjit Barn, Enkhjargal Gombojav, Chimedsuren Ochir, Buyantushig Boldbaatar, Bolor Beejin, Gerel Naidan, Jargalsaikhan Galsuren, Bayarkhuu Legtseg, Tsogtbaatar Byambaa, Jennifer A. Hutcheon, Craig Janes, Patricia A. Janssen, Bruce P. Lanphear, Lawrence C. McCandless, Tim K. Takaro, Scott A. Venners, Glenys M. Webster, Ryan W. Allen