[1] UNIV CALIF SAN DIEGO, MED CTR, DEPT PATHOL, H811F, SAN DIEGO, CA 92103 USA
[2] AGR CANADA, ANIM DIS RES INST, NEPEAN K2H 8P9, ONTARIO, CANADA
[3] CORNELL UNIV, NEW YORK STATE COLL VET MED, ITHACA, NY 14853 USA
[4] UNIV SAN DIEGO, DEPT MATH & COMP SCI, SAN DIEGO, CA 92110 USA