Long-Term Follow-Up of a Patient with Sporadic Nonautoimmune Hyperthyroidism Due to a Thyrotropin-Receptor Mutation (D619G) oleh Eijun Nishihara, MD, Mamiko Tsugawa, MD, Yoshikazu Ozaki, MD, Yuji Nagayama, MD, Shuji Fukata, MD, Mitsuyoshi Hirokawa, MD, Mitsuru Ito, MD, Mitsushige Nishikawa, MD, Hirotoshi Nakamura, MD, Yoshiya Ito, MD, Akira Miyauchi, MD