Ambulatory oxygen therapy with documented self-monitoring of oxygen use improves health status among patients with chronic obstructive pulmonary disease

Youlim Kim, Hye Yun Park, Chin Kook Rhee, Kyung Hoon Min, Kwang Ha Yoo, Seong Yong Lim, Yee Hyung Kim, Seung Hun Jang, Ki-Suck Jung, Yong Il Hwang