TY - JOUR AU - Cnattingius, S TI - The epidemiology of smoking during pregnancy: smoking prevalence, maternal characteristics, and pregnancy outcomes JO - Nicotine Tob Res IS - S02 VL - 6 PY - 2004 DO - 10.1080/14622200410001669187 L3 - PubMed-ID: 15203816 SP - S125 EP - S140 N1 - . Doi: 10.1080/14622200410001669187 ER -