Indications of amputation after limb-salvage surgery of patients with extremity-located bone and soft-tissue sarcomas: A retrospective clinical study - Özgür Baysal; Fevzi Sağlam; Ömer Sofulu; Okan Yiğit; Evrim Şirin; Bülent Erol (Acta Orthopaedica et Traumatologica Turcica, 2021)