@article{doi:10.1001/jamapediatrics.2013.423,
author = {Williams JA and Zimmerman FJ and Bell JF},
title = {NOrms and trends of sleep time among us children and adolescents},
journal = {JAMA Pediatrics},
volume = {167},
number = {1},
pages = {55-60},
year = {2013},
doi = {10.1001/jamapediatrics.2013.423},
URL = { + http://dx.doi.org/10.1001/jamapediatrics.2013.423},
eprint = {/data/Journals/PEDS/926200/poa120059_55_60.pdf}
}