@article{doi:10.1001/jama.2012.3424,
author = {Califf RM and Zarin DA and Kramer JM and Sherman RE and Aberle LH and Tasneem A},
title = {CHaracteristics of clinical trials registered in clinicaltrials.gov, 2007-2010},
journal = {JAMA},
volume = {307},
number = {17},
pages = {1838-1847},
year = {2012},
doi = {10.1001/jama.2012.3424},
URL = { + http://dx.doi.org/10.1001/jama.2012.3424},
eprint = {/data/Journals/JAMA/23360/joc120005_1838_1847.pdf}
}