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The conflicts of interest of the authors unrelated to this work are as the following:\n-AS:\nConsultant with Varian (Medical Advisory Group), Elekta (Gamma Knife Icon), BrainLAB, Merck, Abbvie, Roche\nVice President with International Stereotactic Radiosurgery Society (ISRS)\nAdvisory Board with VieCure\nCo-Chair with AO Spine Knowledge Forum Tumor\nPast educational seminars (honorarium) with AstraZeneca, Elekta AB, Varian (CNS Teaching Faculty), BrainLAB, Medtronic Kyphon, Accuray, Seagen Inc.\nResearch Grant:  Elekta AB, Varian, Seagen Inc.\nTravel accommodations\/expenses: Elekta, Varian, BrainLAB\nAS also belongs to the Elekta MR Linac Research Consortium, Elekta Spine, Elekta Oligometastases and Elekta Linac Based SRS Consortia.\n-JD:\nAdvisor\/consultant: AbbVie, Bayer, Ferring\n-SM:\nHonoraria: AAA\/Novartis, Ipsen\nResearch support: Ipsen\n-CLT: \nTravel accommodations\/expenses and honoraria from Elekta AB for past educational seminars. He belongs to the Elekta MR-Linac Research Consortium.\n-All other authors declare no conflicts.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interests"}},{"value":"This study was approved by the institutional research ethics board (REB). As a retrospective, observational study waiver of informed consent was granted by the REB.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Not applicable.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to publication"}}]}}