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Handling editor Gerd R Burmester
Contributors ST, YK and TT designed the study. ST wrote first draft of the manuscript. All authors edited the manuscript and approved the final version.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests YK has received grants or speaking fees from AbbVie, Astellas, Ayumi, Bristol-Myers Squibb, Chugai, Eisai, Eli Lilly, Hisamitsu, Jansen, Kissei, Pfizer, Sanofi, Takeda, Tanabe-Mitsubishi and UCB. TT has received research grants or speaking fees from Astellas Pharma, Bristol–Myers K.K., Chugai Pharmaceutical, Daiichi Sankyo, Takeda Pharmaceutical, Teijin Pharma, AbbVie GK, Asahikasei Pharma Corp., Mitsubishi Tanabe Pharma, Astra Zeneca K.K., Eli Lilly Japan K.K., Novartis Pharma K.K., Abbivie GK, Nipponkayaku, Janssen, Pharmaceutical K.K., Taiho Pharmaceutical and Pfizer Japan.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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