Alleviating ecological bias in linking radon exposure to health outcomes., De Smedt, T., Simons K, Poffijn A., Francart J., and Van Nieuwenhuyse An , Environment and Health - Bridging South, North, East and West, Conference of ISEE, ISES and ISIAQ, 19/8/2013, Issue ISEE,ISES and ISIAQ, NA, (2013)