[1] SUNY Syracuse, Upstate Med Univ, Syracuse, NY USA
[2] San Francisco VA Med Ctr, San Francisco, CA USA
[3] Univ Calif San Francisco, San Francisco, CA 94143 USA
[4] Baylor Coll Med, Houston Ctr Quality Care & Utilizat Studies, Houston, TX 77030 USA
[5] Michael E De Bakey Vet Affairs Med Ctr, Houston, TX USA
[6] Purdue Univ, W Lafayette, IN USA