Key points are not available for this paper at this time.
From the Department of Pediatrics, University of California, San Diego, School of Medicine, La Jolla CA. Correspondence: Alan J. Card, PhD, MPH, Department of Pediatrics, University of California, San Diego, School of Medicine, 9500 Gilman Drive, La Jolla CA 92093 (e-mail: email protected). The authors report no specific financial support. The authors disclose no conflict of interest.
Alan J. Card (Mon,) studied this question.