Received: 23 October 2020
Accepted: 25 February 2021
First Online: 5 April 2021
Compliance with ethical standards
: Masaru Kato has received research grants from AbbVie, Actelion, and GlaxoSmithKline and speaking fees from Eli Lilly. Tatsuya Atsumi has received research grants from Astellas, Takeda, Mitsubishi Tanabe, Chugai, Daiichi-Sankyo, Otsuka, Pfize, Alexion, Bayer, Otsuka, Chugai, Takeda, Eisai, Bristol-Myers Squibb, Daiichi Sankyo, Mitsubishi Tanabe and AsahiKasei, consultant fees from Ono, Sanofi, Daiichi Sankyo and Pfizer and speaking fees from Mitsubishi Tanabe, Chugai, Astellas, Takeda, Pfizer, Daiichi Sankyo, Bristol-Myers Squibb and Eli Lilly. Other authors have nothing to declare.