An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Urberg KA, Luo Q, Pilgrim C, Degirmencioglu SM.Urberg KA, et al.Addict Behav. 2003 Sep;28(7):1243-56. doi: 10.1016/s0306-4603(02)00256-3.Addict Behav. 2003.PMID: 12915166
Demir M, Urberg KA.Demir M, et al. Among authors: urberg ka.J Exp Child Psychol. 2004 May;88(1):68-82. doi: 10.1016/j.jecp.2004.02.006.J Exp Child Psychol. 2004.PMID: 15093726