1. Online Etymology Dictionary. Guarantee (n.). [webpage] 2017 October 19, 2017 [cited 2023 April 2023]; Available from: https://www.etymonline.com/word/guarantee.
2. Federal Trade Commission. Federal Trade Commission Consumer Advice: Warranty. [Online] 2021 May 2021 [cited 2023 April 2023]; Available from: https://consumer.ftc.gov/articles/warranties.
3. Businesswire.com. Biomet Announces Lifetime Limited Implant Replacement Warranty on Oxford® Partial Knee When Implanted with Signature™* Personalized Patient Care System. 2012 [cited 2023 April 2023]; September 24, 2012:[Available from: https://www.businesswire.com/news/home/20120924006520/en/Biomet-Announces-Lifetime-Limited-Implant-Replacement-Warranty-on-Oxford%C2%AE-Partial-Knee-When-Implanted-with-Signature%E2%84%A2*-Personalized-Patient-Care-System.
4. Standing Proudly behind Our Products;Medtech,2023
5. Medical, T. Thommen Medical Guarantee. [cited 2023 April 2023]; Available from: https://www.thommenmedical.com/fileadmin/Media/05_Downloadcenter/Verschiedenes__alt__andere_Downloads_/Broschueren_Flyer_Thommen_Implantatsyste/Allgemeines_Uebersicht_Unternehmen/Thommen_Medical_Garantie/fo_02d196.03_guarantee_brochure.pdf.