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(a) CD rates of M1 patients with PTC aged 55 years or older and those aged younger than 55 years. (b) CD rates of M1 patients with PTC having tumor 4 cm or smaller and those having tumor larger than 4 cm. (c) CD rates of M1 PTC patients with and without extrathyroid extension. *Except for recurrent laryngeal nerve and cricothyroid or inferior constrictor muscle.
