Kidney transplantation / Bone Metabolism / Renal transplantation / Humans / Female / Male / Bone Density / Body Mass Index / Parathyroid Hormone / Calcitriol / Renal Function / Middle Aged / Repeated Measures / Adult / Clinical Data / Group / Creatinine / Male / Bone Density / Body Mass Index / Parathyroid Hormone / Calcitriol / Renal Function / Middle Aged / Repeated Measures / Adult / Clinical Data / Group / Creatinine