[1] UNIV BIALYSTOK, MED SCH, DEPT BIOCHEM, BIALYSTOK, POLAND
[2] MICROBIOL DEPT, GLAXO RES LTD, GREENFORD, MIDDLESEX, ENGLAND
[3] ROY POSTGRAD MED SCH, DEPT BACTERIOL, LONDON W12 OHS, ENGLAND
[4] UNIV ATHENS, ALEXANDRA HOSP, SCH MED, DEPT CLIN THERAPEUTICS, ATHENS, GREECE
[5] UNIV LONDON, SCH PHARM, DEPT PHARMACEUTICS, MICROBIOL SECT, LONDON WC1N 1AX, ENGLAND