[1] UNIV MICHIGAN, SCH MED, ANN ARBOR, MI USA
[2] UNIV ALABAMA, SCH MED, BIRMINGHAM, AL USA
[3] MED RES CTR, KANSAS CITY, MO USA
[4] UNIV OKLAHOMA, HLTH SCI CTR, OKLAHOMA CITY, OK USA
[5] VET ADM MED CTR, OKLAHOMA CITY, OK USA
[6] DUKE UNIV, MED CTR, DURHAM, NC USA
[7] MED COLL GEORGIA, AUGUSTA, GA 30912 USA
[8] WASHINGTON UNIV, ST LOUIS, MO USA
[9] UNIV VIRGINIA, CHARLOTTESVILLE, VA USA
[10] UNIV TEXAS SAN ANTONIO, SAN ANTONIO, TX 78285 USA
[11] UNIV MISSISSIPPI, JACKSON, MS 39216 USA
[12] UNIV TEXAS SAN ANTONIO, HOUSTON, TX USA
[13] UNIV SO CALIF, LOS ANGELES, CA USA