Angkoon Anuwong1, Hoon Yub Kim2, Gianlorenzo Dionigi3. 1. Department of Surgery, Police General Hospital, Bangkok, Thailand. 2. Department of Surgery, KUMC Thyroid Center, Korea University Hospital, Korea University College of Medicine, Seoul, Korea. 3. 1st Division of Surgery, Research Center for Endocrine Surgery, Department of Surgical Sciences and Human Morphology, University of Insubria (Como-Varese), Varese, Italy. gianlorenzo.dionigi@uninsubria.it.