Prolonged bleeding may occur in particular after a major physical trauma, after an accident, or after surgery involving the buccal, nasal, genital or urinary mucosa. Tooth extraction, #tonsillectomy and ablation of the uterus or prostate are examples of surgeries that entail a high risk of bleeding.
http://www.hemophilia.ca/en/bleeding-disorders/other-factor-deficiencies/factor-xi-deficiency--hemophilia-c/#c1067