Duplex Doppler estimation of resistive index in arcuate arteries of sedated, normal female dogs: implications for use in the diagnosis of renal failure - Rivers, BJ; Walter, PA; Letourneau, JG; Finlay, DE; Ritenour, ER; King, VL; O’Brien, TD; Polzin, DJ (J Am Anim Hosp Assoc, 1997)