Published on in Vol 15 , No 8 (2013) :August
This is a member publication of Washington University School of Medicine Library, Saint Louis MO, USA
1 Division of General Medicine , Department of Internal Medicine , University of Michigan , Ann Arbor , MI , US
2 VA Ann Arbor Center for Clinical Management Research , VA Ann Arbor Healthcare System , Ann Arbor , MI , US
3 Center for Statistical Consultation and Research , University of Michigan , Ann Arbor , MI , US
4 Department of Family Medicine , University of Michigan , Ann Arbor , MI , US