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1 Department of Internal Medicine, Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center, El Paso, Texas. Electronic address: richard.mccallum@ttuhsc.edu.
2 Department of Internal Medicine, University of Tennessee Health Science Center, Veterans Administration Hospital, Memphis, Tennessee. Electronic address: ssolomon@uthsc.edu.
1 Department of Internal Medicine, Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center, El Paso, Texas. Electronic address: richard.mccallum@ttuhsc.edu.
2 Department of Internal Medicine, University of Tennessee Health Science Center, Veterans Administration Hospital, Memphis, Tennessee. Electronic address: ssolomon@uthsc.edu.