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2. The German Institute for Quality and Efficiency in Healthcare Working paper cost estimation http://www.iqwig.de/download/Working_Paper_Cost_Estimation.pdf
3. The German Institute for Quality and Efficiency in Healthcare Working paper modelling http://www.iqwig.de/download/Working_Paper_Modelling.pdf
4. Economic evaluation of FE(NO) measurement in diagnosis and 1-year management of asthma in Germany;Berg;Respir Med,2008
5. Health care and cost of medication for inflammatory bowel disease in the Rhein-Main region, Germany: a multicenter, prospective, internet-based study;Blumenstein;Inflamm Bowel Dis,2008