Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kosaku Nitta and Takashi Akiba and Keiko Uchida and Akira Kawashima and Wako Yumura and Takashi Kabaya and Hiroshi Nihei,The progression of vascular calcification and serum osteoprotegerin levels in patients on long-term hemodialysis,American Journal of Kidney Diseases,0272-6386,Elsevier BV,2003-08,42,2,303-309,https://cir.nii.ac.jp/crid/1363670320358012160,https://doi.org/10.1016/s0272-6386(03)00655-3