Dr. Elfström is an epidemiologist working at the Center for Cervical Cancer Elimination, Karolinska University Hospital and the Screening Unit at the Regional Cancer Center of Stockholm Gotland, Sweden. She is the chair of the Swedish National Working Group for Cervical Cancer Prevention and dedicates her time to screening program monitoring, evaluation, and development. Recently, she has been working on HPV self-sampling as a primary cervical screening tool and risk-stratified screening for cervical cancer. In addition, she has led the ICSN Cervical Cancer Screening Working Group to compare results of audits of cervical cancer cases in programs in Sweden, UK and other countries, and as it reengages in new projects, especially looking at the implementation of HPV-based cervical cancer screening in low- and middle-income countries. Her research focuses on optimizing cervical cancer prevention and her interests include health systems strengthening and evaluating organization and quality assurance of cancer prevention programs.