Analisis praktik residensi spesialis keperawatan medikal bedah pada pasien kanker payudara metastasis paru, hati dan tulang melalui pendekatan Teori Peaceful end of Life di Rumah Sakit Umum Pusat Kanker Dharmais Jakarta = Analysis of medical surgical nursing specialist residency practice in breast cancer patients with Lung, Liver and Bone Metastases through the Peaceful End of Life Theory approach at Dharmais Cancer Center General Hospital, Jakarta