[1] Univ Med Ctr Groningen, Radiat Oncol, Groningen, Netherlands
[2] Hosp Univ Vaudois, Radiat Oncol, Lausanne, Switzerland
[3] Univ Hosp Dusseldorf, Radiat Oncol, Dusseldorf, Germany
[4] Aarhus Univ Hosp, Oncol, Aarhus, Denmark
[5] Clin Univ St Luc, Radiat Oncol, Brussels, Belgium
[6] Univ Manchester, Ctr Radiotherapy Related Res, Manchester, Lancs, England
[7] Univ Hong Kong, Shenzhen Hosp, Clin Oncol, Shenzhen, Peoples R China
[8] Ctr Georges Francois Leclerc, Radiat Oncol, Dijon, France
[9] Royal Marsden Hosp, London, England
[10] Inst Canc Res, Radiat Oncol, London, England
[11] Princess Margaret Hosp, Radiat Oncol, Toronto, ON, Canada
[12] Princess Alexandra Hosp, Canc Serv, Brisbane, Qld, Australia
[13] Univ Texas MD Anderson Canc Ctr, Radiat Oncol, Houston, TX 77030 USA