“…8,13,19 -22,25 The details of the selected studies are listed in Table 1, with a total 66,772 psoriasis cases and 577,415 controls to investigate the risk of susceptibility asthma in patients with psoriasis. There were three retrospective cohort studies 8,13,19 and three cross-sectional cohort studies. 20 -22,25 As for ethnicity, three studies investigated white populations, 19,20,22,25 three studies investigated Asian populations.…”