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2. Ra SW, Sin DD. Should We Screen for Pulmonary Embolism in Severe COPD Exacerbations? Not Just Yet, Primum Non Nocere. Chest 2017;151:523-4.

3. Leitao Filho FS*, Ra SW*, Mattman A, Schellenberg RS, Fishbane N, Criner GJ, Woodruff PG, Lazarus SC, Albert R, Connett JE, Han MK, Martinez FJ, Leung JM, Man SFP, Aaron SD, Reed RM, Sin DD. Serum IgG and risk of exacerbations and hospitalizations in chronic obstructive pulmonary disease. The Journal of allergy and clinical immunology 2017.

4. Han SE, Kwon WJ, Cha HJ, Lee YJ, Lee T, Seo KW, Jegal Y, Ahn JJ, Ra SW. Mediastinal Bronchogenic Cysts: Demonstration of Fluid-Fluid Level in Bronchoscopic US Imaging. Journal of bronchology & interventional pulmonology 2017;24:153-5.