[1] OSPED SAN GIOVANNI BELLINZONA,BELLINZONA,SWITZERLAND
[2] SAHLGRENS UNIV HOSP,S-41345 GOTHENBURG,SWEDEN
[3] NETHERLANDS CANC INST,1066 CX AMSTERDAM,NETHERLANDS
[4] UNIV HOSP ST RAFAEL,DEPT RADIOTHEAPY,B-3000 LOUVAIN,BELGIUM
[5] ROYAL MARSDEN HOSP,SUTTON SM2 5PT,SURREY,ENGLAND