1. European Commission (2014) The 2015 ageing report: underlying assumptions and projection methodologies. 8:1–413. http://ec.europa.eu/economy_finance/publications/european_economy/2014/pdf/ee8_en.pdf . Accessed 29 Feb 2016
2. Aoyagi S, Fukunaga S, Arinaga K, Tomoeda H, Akasu K, Ueda T (2010) Heart valve surgery in octogenarians: operative and long-term results. Heart Vessels 25:522–528
3. Cappabianca G, Ferrarese S, Musazzi A, Terrieri F, Corazzari C, Matteucci M, Beghi C (2016) Predictive factors of long-term survival in the octogenarian undergoing surgical aortic valve replacement: 12-year single-centre follow-up. Heart Vessels. doi: 10.1007/s00380-016-0804-3
4. Biancari F, Barbanti M, Santarpino G, Deste W, Tamburino C, Gulino S, Immè S, Di Simone E, Todaro D, Pollari F, Fischlein T, Kasama K, Meuris B, Dalén M, Sartipy U, Svenarud P, Lahtinen J, Heikkinen J, Juvonen T, Gatti G, Pappalardo A, Mignosa C, Rubino AS (2016) Immediate outcome after sutureless versus transcatheter aortic valve replacement. Heart Vessels 31:427–433
5. Gruppo di Lavoro tecnico dello studio OBSERVANT, D’Errigo P, Fusco D, Grossi C, Ramondo AB, Ranucci M, Santini F, Santoro G, Seccareccia F, Tamburino C (2010) OBSERVANT: observational study of appropriateness, efficacy and effectiveness of AVR-TAVI procedures for the treatment of severe symptomatic aortic stenosis. Study protocol. G Ital Cardiol (Rome) 11:897–909