FGF23 and rickets: The keywords most frequently used by the authors were rickets (n = 188), FGF23 (n = 123), hypophosphataemia (n = 137), PHEX (n = 117), phosphate (n = 84), vitamin D (n = 82), osteomalacia (n = 81), X-linked hypophosphatemic rickets (n = 74) and burosumab (n = 60).