“…From selected studies 16 articles related to patients with COPD, 5 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 three articles related to asthmatic patients, 18 , 38 , 39 six articles about cancer patients, 3 , 40 , 41 and lung transplantation 42 , 43 , 44 and one related to cystic fibrosis (CF) 45 and the last to patients with acute respiratory diseases. 46 The frequency of studies according to respiratory disorders is shown in Figure 2 .…”