FGF23 and systemic sclerosis: In SSc patients, T50 was not significantly correlated to calcium (r 0.09540, p=0.4321, n=70), age (r -0.02944, p=0.7981, n=78), eGFR (r -0.05273, p=0.6488, n=77), FGF23 (r 0.01691, p=0.8848 n=76) or PTH (r 0.1078, p=0.3506, n=77), but showed a correlation with phosphate (r -0.2931, p=0.0131, n=71) and zinc (r 0.3282, p=0.0036, n=77).