Text and Data Mining valid from 2019-01-28
Received: 20 November 2018
Accepted: 18 January 2019
First Online: 28 January 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Keio University School of Medicine (registration number: 20150441). This article does not contain any studies with animals performed by any of the authors.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The institutional review board of the hospital granted permission for this retrospective review of imaging and clinical data, and waived the requirement for obtaining informed consent from the patients.
: TN and MJ received research grants from Nihon Medi-Physics Co., Ltd. and GE Healthcare Corp. MK received a research grant from Nihon Medi-Physics Co., Ltd. The authors declare that they have no competing interests.
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