Received: 13 January 2018
Accepted: 1 March 2018
First Online: 9 March 2018
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the University of Occupational and Environmental Health, Japan. A written informed consent was obtained from the patient.
: Fumihiro Tanaka received lecture fees from Chugai Pharmaceutical Co. Ltd. The other authors declare that they have no competing interests.
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