[1] SUNY HLTH SCI CTR,DEPT MED,450 CLARKSON AVE,BROOKLYN,NY 11203
[2] UNIV KEELE,N STAFFORDSHIRE ROYAL INFIRM,DEPT POSTGRAD MED,STOKE ON TRENT ST4 7QB,ENGLAND
[3] UNIV TORONTO,DEPT SURG,TORONTO M5S 1A1,ONTARIO,CANADA
[4] MT SINAI HOSP,TORONTO M5G 1X5,ONTARIO,CANADA
[5] UNIV NOTTINGHAM HOSP,QUEENS MED CTR,DEPT THERAPEUT,NOTTINGHAM NG7 2UH,ENGLAND