Sutandyo, N., S. A. Kurniawati, N. N. Siregar, and N. K. Sari. “Three Years Survival of Elderly Cancer Patients in Indonesia: Do We Need a Different Approach?”. Acta Medica Indonesiana, vol. 52, no. 1, Apr. 2020, p. 39, https://www.actamedindones.org/index.php/ijim/article/view/1150.