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Article History

Received: 27 February 2018

Accepted: 16 April 2018

First Online: 23 April 2018

Ethics approval and consent to participate

: The study was approved by the ethics committee of Heidelberg University, Medical Faculty Mannheim (2016-806R-MA). Written informed consent for scientific usage of clinical data was obtained from all patients.

: Consent for scientific usage of clinical data was obtained from all patients included in the study.

: Erasmus MC Cancer Institute has research collaborations with Accuray Inc., Sunnyvale, USA.AWMS reports grants from Elekta AB, Stockholm, Sweden, during the conduct of the study; FS reports personal fees from Elekta AB, Sweden, outside the submitted work; OK has nothing to disclose; BJMH reports grants from Elekta AB, Stockholm, Sweden, during the conduct of the study; grants from Accuray Inc., Sunnyvale, USA, outside the submitted work; MLPD reports grants from Elekta AB, Stockholm, Sweden, during the conduct of the study; SB reports grants from Elekta AB, Stockholm, Sweden, during the conduct of the study; grants from Accuray Inc., Sunnyvale, USA, outside the submitted work; FW reports research grants and travel support from Elekta, during the conduct of the study; FL has nothing to disclose; JBH reports teaching honoraria from Elekta AB, Stockholm, Sweden, during the conduct of the study; DB reports personal fees from Siemens AG, personal fees from NB Capital ApS, outside the submitted work.

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