Željko Perdija, M.D., Assistant, after graduating from the Faculty of Medicine, acquired his licence and completed his post-graduate studies on ultrasound use in gastroenterology and hepatology in Zagreb, he specialized in internal medicine, passed all exams at the doctoral study programme at the Faculty of Medicine in Zagreb, a theoretical and practical test in flexible bronchoscopy and additional training at the University Medical Centre Ljubljana on digestive endoscopy. He has completed an intensive four week e-education program Concepts of Cannabis Science I, carried out by Kenevir Research (Oregon, USA), and also follow-up program Concepts of Cannabis Science II. He is a member of the Governing Board and expert associate of the Institute (ICANNA). As a provider of medical examinations, he participates in the national program for early colorectal cancer detection, SVIT. He obtained habilitation as an assistant at the Faculty of Medicine in Maribor and gained experience as a lecturer by teaching at the the Medical School in Maribor. He acquired his clinical experience at the University Medical Centre Maribor, University Clinic of Respiratory and Allergic Diseases Golnik, General Hospital Ptuj and with his work for health care centres.