Sidsel Kreyberg is a Norwegian pathologist who has been working with patients suffering from myalgic encphalomyelitis (M.E., G93.3) since 1997. She started the population based, nation wide, voluntary Registry for ME/PVFS in Norway, which has been running since 2004. The Registry was supported by the foundation Helse & Rehabilitering and has concession from the Data Inspectorate. She has written several articles, brochures and books about ME, mostly in Norwegian. Guidelines for the Registry in Norwegian and English can be found here. The Norwegian version of the Registry guidlines contains an application form for the Registry. Sidsel Kreyberg is also on facebook with more on ME: https://www.facebook.com/MEregisteret.