A. Alpha diversity (Faith’s phylogenetic diversity) pre- and at 3m (Post.3m), 6m (Post. 6m) and 12m (Post.12m) after surgery (p=0.158, ANOVA). B. Principal coordinate analysis plots on unweighted UniFrac distances (beta diversity) comparing samples pre-surgery versus 3m (p= 1.831e-06, Student’s t-test), 6m (p= 1.816e-05), and 12m (p= 0.003676).