[1] YALE UNIV, NEW HAVEN, CT 06510 USA
[2] UNIV TORONTO, TORONTO M5S 3B2, ONTARIO, CANADA
[3] UNIV WISCONSIN, MADISON, WI 53706 USA
[4] RUSH MED COLL, CHICAGO, IL 60612 USA
[5] FLINDERS UNIV, ADELAIDE 5001, AUSTRALIA
[6] UNIV GOTTINGEN, W-3400 GOTTINGEN, GERMANY
[7] UNIV WASHINGTON, SEATTLE, WA 98195 USA
[8] UNIV BONN, W-5300 BONN, GERMANY
[9] UNIV CONSTANCE, W-7750 CONSTANCE, GERMANY
[10] UNIV CAMBRIDGE, CAMBRIDGE CB2 3EA, ENGLAND
[11] UNIV N CAROLINA, CHAPEL HILL, NC 27599 USA
[12] UNIV SYDNEY, SYDNEY, NSW 2006, AUSTRALIA
[13] UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA
[14] CORNELL UNIV, ITHACA, NY 14853 USA
[15] NATL HEART & LUNG INST, LONDON SW3 6L4, ENGLAND
[16] BRANDEIS UNIV, WALTHAM, MA 02254 USA
[17] MAX PLANCK INST BIOPHYS CHEM, W-3400 GOTTINGEN, GERMANY
[18] UNIV TEXAS, MED BRANCH, GALVESTON, TX 77550 USA
[19] UNIV OXFORD, OXFORD OX1 3RB, ENGLAND
[20] UNIV YORK, YORK YO1 5DD, N YORKSHIRE, ENGLAND