SIRT6 and idiopathic pulmonary fibrosis: Specifically, as reported in Fig. 2b-c and in Table 1, SIRT-6 levels (median IPF 242 [146–301] pg/mL vs. median controls 263 [238–328] pg/mL; p = 0.131) and SIRT-7 levels (4742 [3622–6302] ng/mL vs. controls 4957 [2112–5519] ng/mL; p = 0.522) did not exhibit significant variation.