Perbandingan luaran pasca limb salvage surgery dan amputasi pada pasien osteosarkoma periode 1995-2014 di Rumah Sakit Cipto Mangunkusumo = Outcome comparison between limb salvage surgery and amputation for osteosarcoma patients during 1995-2014 period in Cipto Mangunkusumo Hospital / Heru Widyawarman