Received: 16 February 2018
Accepted: 20 July 2018
First Online: 1 August 2018
Ethics approval and consent to participate
: The study was conducted with approval from the St. Marianna University School of Medicine’s Ethics Committee (No. 2713), and it was conducted in accordance with the principles of the Declaration of Helsinki. Informed consent was not obtained from the participants, because of the retrospective nature of the study.
: Not applicable
: The authors declare that they have no competing interests.
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