Dr Woojin Cho is the Representative Director of Withsim Clinic, Bundang, South Korea. He graduated from Korea University in Seoul, South Korea, and trained in Otolaryngology-Head and Neck Surgery at Korea University Anam Hospital. He maintains an active busy practice using Ultrasound, focused exclusively on patients with a lump on the neck including Thyroid nodules, Salivary disease, Lymphadenopathy and various Soft tissue diseases. He is also active in research on Office-based Head and Neck Ultrasound performed by Surgeons and Ultrasonography-guided Procedures (Radiofrequency ablation, Sclerotherapy and Core needle biopsy). He has delivered over 100 scientific presentations worldwide and published more than 20 peer reviewed articles and chapters on medical textbooks, mainly dealing with head and neck ultrasound. As an executive board member of Korean Association of Otorhinolaryngologists and Korean Society of Head and Neck Surgery, he has been in charge of over 20 international and domestic head and neck ultrasound courses for surgeons (Hong Kong, Japan and New Zealand, etc.). He has received three “Presentation of the Year” awards at the Annual Congress of Korean Association of Otorhinolaryngologists.