Kilander, C., Mattsson, F., Ljung, R., Lagergren, J., & Sadr-Azodi, O. (2014). Systematic underreporting of the population-based incidence of pancreatic and biliary tract cancers. Acta Oncologica, 53(6), 822–829. https://doi.org/10.3109/0284186X.2013.857429