Highly concentrated calcitriol and its analogues induce apoptosis of parathyroid cells and regression of the hyperplastic gland--study in rats. - Shiizaki K; Hatamura I; Negi S; Sakaguchi T; Saji F; Imazeki I; Kusano E; Shigematsu T; Akizawa T (Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association, 2008)