Affiliation: | 1. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA;2. Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee, USA;3. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA Department of Veteran Affairs, Tennessee Valley Healthcare System, Nashville, Tennessee, USA;4. School of Medicine, Yale University, New Haven, Connecticut, USA |