This investigation was supported by National Institutes of Health, National Institute of Dental and Craniofacial Research grants U01-DE-16746 and U01-DE-16747. An Internet site devoted to details about DPBRN is located at http://www.DPBRN.org. The authors would like to thank Sha Zhu, Statistician, at the University of Alabama at Birmingham for his help with the DPBRN enrollment data and verification of analyses. Opinions and assertions contained herein are those of the authors and are not to be construed as necessarily representing the views of the respective organizations or the National Institutes of Health. The informed consent of all human subjects who participated in this investigation was obtained after the nature of the procedures had been explained fully. Persons who comprise the DPBRN Collaborative Group for this article are below:
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