Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12968-016-0228-3/MediaObjects/12968_2016_228_Fig2_HTML.gif)
Study flow chart. Summary of the patient selection algorithm and number of subjects in the three study groups: controls, HF (heart failure) patients with low left ventricular ejection fraction (LVEF), and HF patients with normal LVEF
Study flow chart. Summary of the patient selection algorithm and number of subjects in the three study groups: controls, HF (heart failure) patients with low left ventricular ejection fraction (LVEF), and HF patients with normal LVEF