SYNCHROS is a three-years European project funded under the Research Programme Horizon 2020. Project start: Jan. 1st, 2019. Our goal is to coordinate and support the synchronisation of cohorts and population surveys in Europe and worldwide. We focus on practical, methodological, ethical and legal challenges to facilitate research towards the development of stratified and personalised medicine as well as better health policies. Our team is initiated by institutions and experts representing epidemiological and clinical research, patients, legal/ethical competencies and European infrastructures.