[1] RIJKSINST VOLKSGEZONDHEID, 3720 BA BILTHOVEN, NETHERLANDS
[2] UNILEVER RES LAB, COLWORTH LAB, COLWORTH HOUSE, SHARNBROOK MK44 1LQ, BEDS, ENGLAND
[3] MINIST HLTH, PUBL HLTH LAB, HAIFA, ISRAEL
[4] US FDA, PUBL HLTH SERV, DALLAS, TX 75204 USA
[5] USDA, FOOD MICROBIOL BRANCH, BELTSVILLE, MD 20705 USA
[6] US FDA, PUBL HLTH SERV, WASHINGTON, DC 20204 USA
[7] HULL ROYAL INFIRM, PUBL HLTH LAB, Kingston Upon Hull HU3 2JZ, N HUMBERSIDE, ENGLAND
[8] PILLSBURY CO, RES & DEV LABS, MINNEAPOLIS, MN 55414 USA
[9] INST PASTEUR HELLEN, ATHENS 618, GREECE
[10] US FDA, PUBL HLTH SERV, MINNEAPOLIS, MN 55401 USA
[11] NATL FOOD ADM, S-75126 UPPSALA, SWEDEN