From the Division of Child Development and Community Health, Department of Pediatrics, University of California, San Diego, CA; and the Center for Human Growth and Development, University of Michigan, Ann Arbor, MI.
Received February 2011; accepted December 2011.
This study was supported by a grant R01HL088530 from the National Heart, Lung, and Blood Institute.
The content is solely the responsibility of the author and does not necessarily represent the official views of the National Heart, Lung, and Blood Institute or the National Institutes of Health.
Disclosure: The author declares no conflict of interest.
Address for reprints: Sheila Gahagan, MD, MPH, Division of Child Development and Community Health, Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive #0927, La Jolla, CA 92093; e-mail: [email protected].
