pid type title authors mentors source_title published_date url doi isbn issn eissn kbco:28 "journal article" "Vitamin D Status in Renal Transplant recipients is not Associated with Erectile Dysfunction" "Sudarević, Bojan; Begić, Ivana; Šimunović, Dalibor; Kuveždić, Hrvoje; Šerić, Vatroslav; Zibar, Lada"