According to the manufacturer, COL1A2 was selected because it was referenced more often in relation to fibrosis in public data bases than COL1A1. Moreover, the ratio of COL1A2/COL3A1 was decreased in the RH group as compared to NC (1.51 vs. 2.26, p = 0.058, one-sided t test). Here, COL1A1 is linked to fibrosis.