24 Levin Levin A A Bakris G Bakris G L L Molitch Molitch M M Smulders Smulders M M Tian Tian J J Williams Williams LA LA Prevalence of abnormal serum vitamin D, PTH, calcium, and phosphorus in patients with chronic kidney disease: results of the study to evaluate early kidney disease Prevalence of abnormal serum vitamin D, PTH, calcium, and phosphorus in patients with chronic kidney disease: results of the study to evaluate early kidney disease Kidney Int Kidney Int 2007 2007 71 71 31 31 38 38 17091124 17091124. Here, PTH is linked to kidney disorder.