Does prophylactic treatment with felodipine, a calcium antagonist, prevent low-osmolar contrast-induced renal dysfunction in hydrated diabetic and nondiabetic patients with normal or moderately reduced renal function? - Spangberg Viklund,B.; Berglund,J.; Nikonoff,T.; Nyberg,P.; Skau,T.; Larsson,R. (Scand J Urol Nephrol, 1996)