Lubis N, Hasnida H, Novitarum L. Develop Empowerment Whatsapp Group to Increase Optimism of Breast Cancer Survivors. PICNHS [Internet]. 28Nov.2021 [cited 21Jun.2026];2(2):117-26. Available from: http://jurnal.globalhealthsciencegroup.com/index.php/PICNHS/article/view/932