Development and Evaluation of an Improved Technique for Pulmonary Function Testing Using Electrical Impedance Pneumography Intended for the Diagnosis of Chronic Obstructive Pulmona... oleh Myeong Heon Sim, Min Yong Kim, In Cheol Jeong, Sung Bin Park, Suk Joong Yong, Won Ky Kim, Hyung Ro Yoon