1. Placental mitochondrial DNA and CYP1A1 gene methylation as molecular signatures for tobacco smoke exposure in pregnant women and the relevance for birth weight Janssen, Bram G.; Gyselaers, Wilfried; Byun, Hyang-Min; Roels, Harry A.; Cuypers, Ann; Baccarelli, Andrea A.; Nawrot, Tim S. 2017 Articles Pregnant women--Tobacco useMitochondrial DNADNA--MethylationEpigeneticsBirth weight, Low