The actions of parathyroid hormone on bone: relation to bone remodeling and turnover, calcium homeostasis, and metabolic bone disease: part IV of IV parts: the state of the bones in uremic hyperparathyroidism: the mechanisms of skeletal resistance to PTH in renal failure and pseudohypoparathyroidism and the role of pth in osteoporosis, osteopetrosis, and osteofluorosis