AU  - Califf RM, Zarin DA, Kramer JM, Sherman RE, Aberle LH, Tasneem A
TI  - CHaracteristics of clinical trials registered in clinicaltrials.gov, 2007-2010
PT  - JOUR
DP  - 2012
TA  - JAMA
pages = {1838-1847},
VI  - 307
IP  - 17
AID  - 10.1001/jama.2012.3424 [doi]
4100  - http://dx.doi.org/10.1001/jama.2012.3424
SO  - JAMA May 2, 2012 307(17):1838