Significance of Combined Emphysema in Idiopathic Pulmonary Fibrosis and Serum Surfactant Protein-D as a Prognostic Factor

*Corresponding author: Keiki Yokoo, Masanori Shiratori*, Kimiyuki Ikeda, Yasuaki Umeda, Mitsuo Otsuka, Hirotaka Nishikiori, Hirofumi Chiba, Hiroyuki Koba and Hiroki Takahashi

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