1. Gotter, A., Healthline Editorial Team: Benign Tumors. Healthline, 4 Aug. 2016. [Online]. Available: https://www.healthline.com/health/benign.
2. Nordqvist, C.: What are the different types of tumors? Medical News Today, 5 Dec. 2017. [Online]. Available: https://www.medicalnewstoday.com/articles/249141.php.
3. Watanabe, K., Tachibana, O., Sato, K., Yonekawa, Y., Kleihues, P., Ohgaki, H.: Overexpression of the EGF receptor and p53 mutations are mutually exclusive in the evolution of primary and secondary glioblastomas. Brain Pathol. 6(3), 217–223 (1996)
4. National Cancer Institute: Metastatic Cancer. National Cancer Institute, 6 Feb. 2017. [Online]. Available: https://www.cancer.gov/types/metastatic-cancer
5. Huang, A.J., Huang, K.E., Lee, J.W.: Advances in imaging technology and increases in healthcare accessibility have led to shifts in the initial staging of pediatric cancers in the USs. AAP Pediatrics 141(1) (2018)