[1] Univ Toronto, Princess Margaret Canc Ctr, Dept Radiat Oncol, Toronto, ON M5G 2M9, Canada
[2] Dalhousie Univ, Dept Radiat Oncol, Nova Scotia Hlth, Halifax, NS B3H 4R2, Canada
[3] Univ Toronto, Odette Canc Ctr, Sunnybrook Hlth Sci Ctr, Dept Radiat Oncol, Toronto, ON M4N 3M5, Canada
[4] Med Coll Wisconsin, Dept Radiat Oncol, Milwaukee, WI 53226 USA
[5] Univ Texas Southwestern, Dept Radiat Oncol, Dallas, TX 75235 USA
[6] Odense Univ Hosp, Dept Oncol, DK-5000 Odense, Denmark
[7] Univ Med Ctr, Dept Radiotherapy, Div Imaging & Oncol, NL-3584 CX Utrecht, Netherlands
[8] Christie NHS Fdn Trust, Dept Radiotherapy, Manchester M20 4BX, England
[9] King Hussein Canc Ctr, Dept Radiat Oncol, Amman 11941, Jordan
[10] GenesisCare, Alexandria, NSW 2015, Australia
[11] Fiona Stanley Hosp, Dept Radiat Oncol, Perth, WA 6150, Australia
[12] GenesisCare, Perth, WA 6150, Australia
[13] Manipal Acad Higher Educ, Kasturba Med Coll, Manipal Comprehens Canc Care Ctr, Dept Radiotherapy & Oncol, Manipal 576104, India
[14] Univ Hosp Tubingen, Dept Radiat Oncol, D-72076 Tubingen, Germany
[15] Linac Based RT, Med Affairs & Clin Res, I-20864 Milan, Lombardy, Italy