Lang, Erich K., et al. “Efficacy of Percutaneous Cryoablation of Renal Cell Carcinoma in Older Patients With Medical Comorbidities: Outcome Study in 70 Patients”. Canadian Urological Association Journal, vol. 9, no. 5-6, May 2015, pp. E256-61, doi:10.5489/cuaj.2597.