[1] DR DANIEL DEN HOED KLINIEK,DEPT CLIN BIOCHEM,ROTTERDAM,NETHERLANDS
[2] STATE UNIV UTRECHT,DEPT CLIN SCI COMPAN ANIM,UTRECHT,NETHERLANDS
[3] STATE UNIV UTRECHT,FAC VET MED,DEPT PATHOL,UTRECHT,NETHERLANDS
[4] STATE UNIV UTRECHT HOSP,ENDOCRINOL LAB,3511 GV UTRECHT,NETHERLANDS