*3.7. Serum Hormone Analysis*

Commercially available ELISA kits were used to measure serum thyroxine (T4) and triiodothyronine (T3) (Calbiotech, Spring Valley, CA, USA), norepinephrine and epinephrine (Labor Diagnostika Nord, Nordhorn, Germany), as well as corticosterone (Cayman chemical company, Ann Arbor, MI, USA). 
