[1] CORNELL UNIV, NEW YORK STATE COLL VET MED, DEPT AVIAN & AQUAT ANIM MED, ITHACA, NY 14853 USA
[2] CORNELL UNIV, NEW YORK STATE COLL AGR & LIFE SCI, DEPT POULTRY SCI, DIV NUTR SCI, ITHACA, NY 14853 USA
[3] CORNELL UNIV, NEW YORK STATE COLL VET MED, DEPT PATHOL, ITHACA, NY 14853 USA
[4] CORNELL UNIV, NEW YORK STATE, COLL VET MED, DEPT PHYS BIOL, ITHACA, NY 14853 USA