Pathological metastatic lymph node density (ND) predicts early recurrence in papillary thyroid cancer patients after curative resection - Okamoto, Riku; Katoh, Hiroshi; Naito, Kanako; Mitsuma, Tomoya; Ozawa, Yuka; Tokito, Takaaki; Kikuchi, Mariko; Yamashita, Keishi; Sangai, Takafumi (Gland Surgery, 2025)