Vitamin D - blood, Vitamin D - analogs & derivatives, Iron - administration & dosage, Procollagen - blood, Iron - deficiency, Collagen Type I - blood, Bone Resorption - therapy, Ferritins - blood, Peptides - blood, Vitamin D - administration & dosage, Peptide Fragments - blood, Bone Remodeling - physiology, Bone Resorption - etiology, Nutritional Status - ph...