[1] HARVARD HOSP,SALISBURY,WILTS,ENGLAND
[2] MRC,BURNS UNIT,BIRMINGHAM,ENGLAND
[3] UNIV ASTON,BIRMINGHAM B4 7ET,W MIDLANDS,ENGLAND
[4] UNIV GLASGOW,BUILDING SERV,RES UNIT,GLASGOW G12 8QQ,SCOTLAND
[5] CLIN RES CTR,MRC,HARROW HA1 3UJ,MIDDX,ENGLAND
[6] MRC,BIOSTAT UNIT,CAMBRIDGE,ENGLAND