ADAMCZYK-GRUSZKA, Olga, GRUSZKA, Jakub, ŚWIERCZ, Grzegorz and ZWIERZYŃSKA, Anna. Carcinoid syndrome: clinical case report of carcinoid tumor: duodenal bulb, lung, renal clear cell carcinoma. Journal of Education, Health and Sport. Online. 13 March 2022. Vol. 12, no. 3, pp. 42-52. [Accessed 7 July 2025]. DOI 10.12775/JEHS.2022.12.03.004.