[1] UNIV MASSACHUSETTS, SCH MED, WORCESTER, MA 01605 USA
[2] UNIV CALIF IRVINE, COLL MED, IRVINE, CA 92664 USA
[3] HARVARD UNIV, SCH PUBL HLTH, BOSTON, MA 02115 USA
[4] COLUMBIA UNIV, NEW YORK, NY 10032 USA
[5] BAYLOR UNIV, COLL MED, HOUSTON, TX 77031 USA
[6] UNIV MINNESOTA, SCH MED, MINNEAPOLIS, MN 55455 USA
[7] WATSON CLIN, LAKELAND, FL 33802 USA
[8] LAHEY CLIN FDN, BOSTON, MA 02215 USA
[9] US PHS HOSP, SEATTLE, WA 98195 USA
[10] UNIV FLORIDA, COLL MED, GAINESVILLE, FL 32610 USA
[11] UNIV CALIF SAN FRANCISCO, SCH MED, SAN FRANCISCO, CA 94143 USA
[12] UNIV WASHINGTON, SCH MED, SEATTLE, WA 98195 USA
[13] VET ADM HOSP, ASHVILLE, NC 28805 USA