Finally, 42 eligible publications5,16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56 were selected from 62 candidate papers (Figure 1) and the characteristics of the included studies are summarized in Table 1. Fifty-nine populations were presented in these 42 publications. Patients were classified into 8 categories for analysis: coronary artery disease,25,28,34,51 dilated