[1] ZENECA CTL,MACCLESFIELD SK10 4TJ,CHESHIRE,ENGLAND
[2] US EPA,NHEERL,RES TRIANGLE PK,NC 27711
[3] CIIT,RES TRIANGLE PK,NC 27709
[4] GSF FORSCHUNGSZENTRUM UNWELT & GESUNDHEIT GMBH,D-85758 OBERSCHLEISSHEIM,GERMANY
[5] CTR ENVIRONM HLTH,OTTAWA,ON K1A 0L2,CANADA
[6] DEPT HLTH,DIV HEF,LONDON SE1 6LW,ENGLAND
[7] NIEHS,RES TRIANGLE PK,NC 27709
[8] BIBRA INT,CARSHALTON SM5 4DS,SURREY,ENGLAND
[9] NATL INST HLTH SCI,BIOL SAFETY RES CTR,DIV GENET & MUTAGENESIS,SETAGAYA KU,TOKYO 158,JAPAN
[10] UNEP,NAIROBI,KENYA
[11] WHO,PCS,IRRU,RES TRIANGLE PK,NC 27709
[12] WHO,PCS,ARM,CH-1211 GENEVA,SWITZERLAND