[1] MT ZION HOSP & MED CTR, SAN FRANCISCO, CA 94115 USA
[2] SAN FRANCISCO GEN HOSP, SAN FRANCISCO, CA 94110 USA
[3] HERRICK HOSP, BERKELEY, CA USA
[4] ALTA BATES HOSP, BERKELEY, CA USA
[5] FRANKLIN HOSP, SAN FRANCISCO, CA USA
[6] EL CAMINO HOSP, MT VIEW, CA USA
[7] SUTTER HOSP, SACRAMENTO, CA USA
[8] STANFORD HOSP, STANFORD, CA USA
[9] UNIV CALIF SAN FRANCISCO, MED CTR, SAN FRANCISCO, CA 94143 USA
[10] LEMUEL SHATTUCK HOSP, BOSTON, MA USA
[11] MASS DEPT PUBL HLTH, STATE LAB INST, BIOL LABS, BOSTON, MA USA
[12] TUFTS UNIV, SCH MED, BOSTON, MA 02111 USA
[13] SISTER KENNY INST, MINNEAPOLIS, MN USA
[14] UNIV MINNESOTA, SCH MED, MINNEAPOLIS, MN 55455 USA
[15] METHODIST HOSP, HOUSTON, TX 77025 USA
[16] BEN TAUB HOSP, HOUSTON, TX USA
[17] VET ADM HOSP, HOUSTON, TX 77211 USA
[18] BAYLOR UNIV, COLL MED, HOUSTON, TX 77025 USA
[19] SUNY, DOWNSTATE MED CTR, BROOKLYN, NY 11203 USA
[20] KINGS CTY HOSP CTR, BROOKLYN, NY 11203 USA
[21] LONG ISL COLL HOSP, BROOKLYN, NY 11201 USA
[22] BROOKLYN KIDNEY CTR, BROOKLYN, NY USA
[23] NEW YORK HOSP, NEW YORK, NY 10021 USA
[24] CORNELL UNIV, NEW YORK HOSP, MED CTR, NEW YORK, NY 10021 USA