TSH-Lowering Levothyroxine Therapy Is Associated with Higher rT3 and Stable fT3 Levels in Euthyroid Patients with Papillary Thyroid Microcarcinoma During Active Surveillance - Yoshiki Furumura; Akira Miyauchi; Mitsuru Ito; Mitsushige Nishikawa; Nozomi Yamasaki; Hideyuki Iwayama; Masumi Iwasa; Masashi Yamamoto; Makoto Fujishima; Yasuhiro Ito; Takashi Akamizu (Thyroid®, 2026)