TGFB1 and phosphoglycerides measurement : Using data from 28 patients and 20 healthy controls, Kolundžić et al. identified association signals of rs1800470 in TGFB1 and rs1800796 in IL-6 with severe hip osteoarthritis in adulthood20, and using data from 68 cases and 152 controls, Čengić et al. reported significant associations between these two SNPs and severe hip osteoarthritis21.