Pirkey-Ehrhart N, Withrow SJ, Straw RC, Ehrhart E, Page RL, Hottinger HL, Hahn KA, Morrison WB, Albrecht MR, Hedlund CS, Hammer AS, Holmberg DL, Moore AS, King RR, Klausner JS. J Am Anim Hosp Assoc 1995;31:65-69.
Pirkey-Ehrhart N, Withrow SJ, Straw RC, Ehrhart E, Page RL, Hottinger HL, Hahn KA, Morrison WB, Albrecht MR, Hedlund CS, Hammer AS, Holmberg DL, Moore AS, King RR, Klausner JS. J Am Anim Hosp Assoc 1995;31:65-69.