Effects of theophylline and ipratropium bromide on exercise performance in patients with stable chronic obstructive pulmonary disease
Mitsuhiro Tsukino, Koichi Nishimura, Akihiko Ikeda, Takashi Hajiro, Hiroshi Koyama, Takateru Izumi
Thorax Apr 1998, 53 (4) 269-273; DOI: 10.1136/thx.53.4.269