1. Department of Medical Oncology and Oncology Diseases in Gastroenterology, Complex Oncology Center Plovdiv EOOD, Plovdiv, Bulgaria
2. Amgen EOOD, Sofia, Bulgaria
3. Amgen (Europe) GmbH, Rotkreuz, Switzerland
4. 2KMM Sp. z.o.o., Katowice, Poland
5. Department of Medical Oncology, Complex Oncology Center Shumen EOOD, Shumen, Bulgaria