Chodosh J, Ferrell B A, Shekelle P G, Wenger N S
Division of Geriatrics, Department of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1687, USA.
Ann Intern Med. 2001 Oct 16;135(8 Pt 2):731-5. doi: 10.7326/0003-4819-135-8_part_2-200110161-00012.