Received: 2 November 2018
Accepted: 17 January 2019
First Online: 13 February 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of Mie University Graduate School of Medicine and Faculty of Medicine (No. 3150). Informed consent was not obtained from participating patients, because the data were collected retrospectively from electronic medical records.
: Not applicable.
: The authors declare that they have no competing interests.
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