1. Endocrine Oncology Branch; National Cancer Institute; National Institutes of Health; Bethesda MD USA
2. Nuclear Medicine Department; Clinical Research Center; National Institutes of Health; Bethesda MD USA
3. Thoracic and Endocrine Surgery; University Hospitals of Geneva; Geneva Switzerland
4. Department of Surgery; University Multiprofile Hospital for Active Treatment ‘Alexandrovska’; Medical University; Sofia Bulgaria