Medical Service, Department of Veterans Affairs Medical Center and Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas.
Correspondence to Dr. Orson W. Moe, Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75235-8856. Phone: 214-648-3152; Fax: 214-648-2071; E-mail: [email protected]
Accepted March 24, 1999
Received January 11, 1999
