Bekelman Justin E, Kim Miranda, Emanuel Ezekiel J
Perelman Center for Advanced Medicine, 4 West, University of Pennsylvania Perelman School of Medicine, 3400 Civic Center Blvd, Philadelphia, PA 19104, USA.
JAMA Intern Med. 2013 Jun 10;173(11):958-9. doi: 10.1001/jamainternmed.2013.635.