Lubis, Namora, Hasnida Hasnida, and Lilis Novitarum. 2021. “Develop Empowerment Whatsapp Group to Increase Optimism of Breast Cancer Survivors”. Proceedings of the International Conference on Nursing and Health Sciences 2 (2), 117-26. https://doi.org/10.37287/picnhs.v2i2.932.