Serum surfactant protein D as a predictive biomarker for the efficacy of pirfenidone in patients with idiopathic pulmonary fibrosis: a post-hoc analysis of the phase 3 trial in Jap... oleh Kimiyuki Ikeda, Hirofumi Chiba, Hirotaka Nishikiori, Arata Azuma, Yasuhiro Kondoh, Takashi Ogura, Yoshio Taguchi, Masahito Ebina, Hiroki Sakaguchi, Shogo Miyazawa, Moritaka Suga, Yukihiko Sugiyama, Toshihiro Nukiwa, Shoji Kudoh, Hiroki Takahashi, Pirfenidone Clinical Study Group in Japan