[1] LORD RANK RES CTR,RHM RES & ENGN,HIGH WYCOMBE HP12 3QR,BUCKS,ENGLAND
[2] MAFF,CSL,FOOD SCI LAB,NORWICH NR4 7UQ,ENGLAND
[3] GLASGOW ROYAL INFIRM,INST BIOCHEM,TRACE ELEMENT UNIT,GLASGOW G4 0SF,SCOTLAND
[4] HLTH & SAFETY EXECUT,DIV RES & LAB SERV,SHEFFIELD S3 7HQ,ENGLAND