[1] UNIV CALIF SAN DIEGO, CTR MED, LA JOLLA, CA 92103 USA
[2] MRC, LONDON WC1E 6AS, ENGLAND
[3] BAYLOR COLL MED, HOUSTON, TX 77030 USA
[4] METHODIST HOSP, HOUSTON, TX 77030 USA
[5] SUNY DOWNSTATE MED CTR, BROOKLYN, NY 11203 USA
[6] YESHIVA UNIV ALBERT EINSTEIN COLL MED, BRONX, NY 10461 USA
[7] NEW YORK MED COLL, NEW YORK, NY 10029 USA
[8] CUNY, NEW YORK, NY 10021 USA