Schiodt M, Larsson Wexell C, Herlofson BB, Giltvedt KM, Norholt SE, Ehrenstein V. Existing data sources for clinical epidemiology: Scandinavian Cohort for osteonecrosis of the jaw – work in progress and challenges. Clinical Epidemiology. 2015;7:107-16. doi: 10.2147/CLEP.S71796