Pohrybieniuk, J., Krotliński, A., Dusińska, A., Sokołowska, J., & Chabowski, M. (2022). Loneliness among surgical patients - measuring levels of loneliness using De Jong Gierveld Loneliness Scale and Revised UCLA Loneliness Scale. Journal of Education, Health and Sport, 12(12), 303–310. https://doi.org/10.12775/JEHS.2022.12.12.046