[1] FUJITA GAKUEN UNIV, NAGOYA, JAPAN
[2] CATHOLIC UNIV LEUVEN, B-3000 LOUVAIN, BELGIUM
[3] STATE UNIV UTRECHT, UTRECHT, NETHERLANDS
[4] FREE UNIV BRUSSELS, B-1050 BRUSSELS, BELGIUM
[5] INDIANA UNIV, KRANNERT INST CARDIOL, INDIANAPOLIS, IN 46204 USA
[6] UNIV LONDON, LONDON, ENGLAND
[7] KAROLINSKA HOSP, S-10401 STOCKHOLM 60, SWEDEN
[8] UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND
[9] WHO, CH-1211 GENEVA 27, SWITZERLAND
[10] DALHOUSIE UNIV, HALIFAX B3H 4H2, NS, CANADA
[11] ACAD MED SCI USSR, CARDIOL SCI CTR, MOSCOW, USSR
[12] UNIV LIMBURG, 6200 MD MAASTRICHT, NETHERLANDS