[1] PAISLEY COLL TECHNOL,DEPT CHEM,PAISLEY PA1 2BE,RENFREW,SCOTLAND
[2] JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT ENVIRONM HLTH SCI,DIV ENVIRONM CHEM,BALTIMORE,MD 21205
[3] CHRISTIE HOSP & HOLT RADIUM INST,PATERSON LABS,MANCHESTER M20 9BX,LANCS,ENGLAND