[1] Michael E DeBakey VA Med Ctr, Houston Vet Affairs Ctr Innovat Qual Effectivenes, 2002 Holcombe Blvd, Houston, TX 77030 USA
[2] Baylor Coll Med, Dept Med, Houston, TX 77030 USA
[3] Univ Texas Hlth Sci Ctr Houston, Sch Biomed Informat, Houston, TX 77030 USA
[4] Univ Texas Houston, Mem Hermann Ctr Healthcare Qual & Safety, Houston, TX USA