1. VA/DoD Clinical Practice Guideline for Management of Pregnancy,2009
2. Substance use in pregnancy;Wong;J Obstet Gynaecol Can,2011
3. U.S. Office of the Surgeon General, Office on Smoking and Health. The Health Consequences of Smoking: A Report of the Surgeon General. Atlanta, GA: CDC; 2004. www.ncbi.nlm.nih.gov/books/NBK44695/. Accessed December 3, 2015.
4. Spontaneous quitting: self-initiated smoking cessation in early pregnancy;Solomon;Nicotine Tob Res,2004
5. CDC. Trends in smoking before, during, and after pregnancy—Pregnancy Risk Assessment Monitoring System (PRAMS), United States, 31 sites, 2000-2005;Tong;MMWR Surveill Summ,2009