[1] UNIV HELSINKI,CENT HOSP,DEPT MED 4,DIV RHEUMATOL,SF-00260 HELSINKI 26,FINLAND
[2] UNIV HELSINKI,CENT HOSP,DEPT ORTHOPAED & TRAUMATOL,SF-00260 HELSINKI 26,FINLAND
[3] UNIV HELSINKI,INST GENE TECHNOL,DEPT VIROL,SF-00100 HELSINKI 10,FINLAND
[4] HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT HISTOCHEM,LONDON W12 0HS,ENGLAND