The samples of CC were collected for immunofluorescence staining. The frozen sections were incubated with a primary antibody against anti-α-SMA (1:200; Affinity). Cy3-labeled goat anti-mouse IgG was used as secondary antibodies (1:500; Beyotime). Masson’s trichrome staining was performed to quantify the ratio of smooth muscle and collagen in the CC [18 (link)].