Yost et al. BMC Public Health 2010, 10:465 http://www.biomedcentral.com/1471-2458/10/465 National Institute of Child Health and Human Development, with cooperative funding from 23 other federal agencies and foundations. Special acknowledgment is due Ronald R. Rindfuss and Barbara Entwisle for assistance in the original design. Information on how to obtain the Add Health data files is available on the Add Health website http://www.cpc.unc. edu/addhealth. No direct support was received from grant P01-HD31921 for this analysis. Author details 1School of Nursing, McMaster University, Hamilton, Ontario, CA, USA. 2College of Nursing, New York University, New York, NY, USA. 3NYU Langone Medical Center, New York, NY, USA and College of Nursing, New York University, New York, NY, USA. 4Department of Epidemiology &Health Promotion Director of Biostatistics, Bluestone Center for Clinical Research Colleges of Dentistry & Nursing, New York University, New York, NY, USA. Authors’ contributions JY had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis, including interpretation, as well as drafted and critically revised the manuscript. BKM contributed to the design of the study and revisions of the manuscript. WB contributed to the design of the study, interpretation of the data, and revisions of the manuscript. RN contributed to the design of the study and data analysis and interpretation, as well as revisions of the manuscript. All authors read and approved the final manuscript. Competing interests The authors declare that they have no competing interests. Received: 21 April 2010 Accepted: 9 August 2010 Published: 9 August 2010 References 1. 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