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...a hint how to solve this problem? Thanks very much. Fabio ------------------------------------------------------------------------ --- Fabio Valeri, MSc University of Bern Institute of Social and Preventive Medicine Division of International & Environmental Health Finkenhubelweg 11 - CH-3012 Bern Tel +41 (0)31 631 35 10 - Fax +41 (0)31 631 35 20 - www.ispm.ch [[alternative HTML version deleted]]

Check this out, this might help http://arxiv.org/abs/0801.2934 Ben Spycher PhD student Division of Clinical Epidemiology & Biostatistics Institute of Social and Preventive Medicine University of Berne Finkenhubelweg 11 - CH-3012 Berne, Switzerland Tel +41 31 631 35 07 / Fax +41 31 631 35 20 www.ispm.ch <http://www.ispm.ch/> [[alternative HTML version deleted]]