Article History
Received: 8 May 2018
Accepted: 12 June 2018
First Online: 10 July 2018
Compliance with ethical standards
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: Dr. Tatsuo Kanda received research grants from Merck Sharp and Dohme (MSD), Chugai Pharm and AbbVie. The funding sponsors played no role in the study design, data collection, analyses, interpretation, writing of the manuscript, or in the decision to publish the results. Shunichi Matsuoka and Mitsuhiko Moriyama declared that there are no conflicts of interest.
: This article does not contain any studies with human participants or animals performed by any of authors.