aMayo Clinic, Rochester, MN, USA
bDepartment of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, 600 N. Wolfe Street/Meyer 218, Baltimore, MD 21287-7218, USA
cDepartment of Medicine, Johns Hopkins University School of Medicine, 600 N. Wolfe Street/Meyer 218, Baltimore, MD 21287-7218, USA
dDepartment of Medicine, University of Maryland, Baltimore VA Medical Center, 10 N. Greene Street/RMA-125, Baltimore MD 21201, USA
*Corresponding author. Tel.: +1-410-614-9850; fax: +1-410-614-3366
E-mail: [email protected]
Submitted January 10, 2001; revised August 1, 2001; accepted August 20, 2001.