TY - RPRT TI - When should systematic patient positioning errors in radiotherapy be corrected? AU - Thomas Bortfeld AU - Marcel van Herk AU - Steve B Jiang PY - 2002 DO - 10.1088/0031-9155/47/23/401 UR - https://pubmed.ncbi.nlm.nih.gov/12502052/ ID - 12502052 ER -