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IEO received a research grant from Accuray Inc. entitled: \u201cData collection and analysis of Tomotherapy and CyberKnife breast clinical studies, breast physics studies and prostate study\u201d. Maria Alessia Zerella had a research fellowships from AIRC under IG 2019\u2014ID. 23118 project \u201cPhase I\/II clinical trial on single fraction ablative preoperative radiation treatment for early-stage breast cancer\u201d. Mattia Zaffaroni received a research grant by the European Institute of Oncology-Cardiologic Center Monzino Foundation (FIEO-CCM), with a project entitled \"Proton therapy vs photon-based IMRT for parotid gland tumors: a model based approach with Normal Tissue Complication Probability (NTCP)\u201d outside the current study. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The remaining authors declare no conflicts of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This study was performed in line with the principles of the Declaration of Helsinki.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}}]}}