Over the next few weeks, cartilage grew to replace the collagen. The ears were implanted within the epidermis on the backs of lab rats then. Three months later, the grown ears were crafted from cartilage cells and kept its original shape still. Now Bonassar’s team can do the procedure even faster utilizing the living cells in that collagen gel as the printer’s ‘ink.’ The 3D technology directly layers the gel into the right ear shape for cartilage to cover simply, without needing to make a mold first. The next thing is to employ a patient’s own cells in the 3D printing process.Statistical Analysis We used Pearson’s correlation coefficient to quantify the correlation between your estimation of systolic pulmonary arterial pressure upon echocardiography and the measurement on catheterization. For intergroup comparisons, we used evaluation of variance, Student’s t-test, or the Wilcoxon test for continuous variables, depending on the quantity of groups for comparison and on the normality of the distribution. For categorical data, we utilized the chi-square test or Fisher’s exact test, according to the expected quantity of sufferers in each cell. To adjust for multiple comparisons, we performed post hoc Bonferroni lab tests for constant variables.