Competing interests
NB
NT has received honoraria from Taiho. HH has received honoraria form Eli Lilly and Taiho, and research grant from Taiho. KN has received a consulting fee (paid to the university) from Eli Lilly. KH has received research grant from Taiho. TM (Toshiki Masuishi) have no conflicts of interest to declare. TM (Toshihiko Matsumoto) has received honoraria from Eli Lilly and Taiho. HK has received consulting fees from Eli Lilly and Taiho, and research funding from Taiho. KY has received research grant from Taiho, and received honoraria from Taiho and Eli Lilly. SH has received honoraria from Eli Lilly and Taiho. NB has received honoraria from Eli Lilly and Taiho. KM has received research grant from Taiho, and received honoraria from Taiho and Eli Lilly.