Keiki Yokoo, Masanori Shiratori, Kimiyuki Ikeda, Yasuaki Umeda, Mitsuo Otsuka, Hirotaka Nishikiori, … Hiroki Takahashi. (2017). Significance of Combined Emphysema in Idiopathic Pulmonary Fibrosis and Serum Surfactant Protein-D as a Prognostic Factor. Pulmonary Research and Respiratory Medicine, 4(2), 24–32. https://doi.org/10.17140/PRRMOJ-4-135