Thyroid hormone metabolism is highly dependent on serum levels of iodine. Thyroid function will be assessed by measuring serum levels of free thyroxine, free triiodothyronine, and thyroid stimulating hormone also at 1 hour, 2 hours, 4 hours, 6 hours, 24 hours, 1 week, and 1 month after exposure. Measuring thyroid function is important since hypothyroidism has been known to have a major impact on postoperative wound healing.