We conducted this study with 246 patients from seven teaching hospitals (Massachusetts General Hospital (N=92), Newton-Wellesley Hospital (N=49), University of Colorado Hospital (N=40), Brigham and Women's Hospital (N=33), Boston Medical Center (N=18), Nashville Veterans Administration Medical Center (N=8), and Vanderbilt University Medical Center (N=6)). Institutional Review Board approval was obtained at each hospital. Study participants provided written informed consent.
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