[1] Baylor Coll Med, Michael E DeBakey Dept Surg, Houston, TX 77030 USA
[2] Michael E DeBakey VA Med Ctr, Ctr Innovat Qual Effectiveness & Safety, Houston, TX USA
[3] Baylor Coll Med, Dept Med, Houston, TX 77030 USA
[4] Qualitat Hlth Res Consultants, Madison, WI USA
[5] Texas A&M Univ, Dept Commun, College Stn, TX USA