Fig. 1From: Effects of ghrelin treatment on exertional dyspnea in COPD: an exploratory analysisOutline of the study design. The substudy was conducted in a single center (Toneyama National Hospital) as part of the main multicenter trial. In this study, of 20 patients in the substudy, 16 patients could be analyzed the break-point evaluations in an exploratory manner by use of data from the substudyBack to article page