[1] ICI PLC, DIV PHARMACEUT, MACCLESFIELD SK10 4TG, CHESHIRE, ENGLAND
[2] BROOK GEN HOSP, LONDON, ENGLAND
[3] ERASME UNIV HOSP, BRUSSELS, BELGIUM
[4] TAMPERE UNIV, CENT HOSP, TAMPERE, FINLAND
[5] TOOLO HOSP, HELSINKI, FINLAND
[6] MAUDSLEY HOSP, LONDON SE5 8AZ, ENGLAND