Demenz Angehörige Gesprächsgruppe – Langenthal is a group led by a professional in Langenthal, Switzerland, for relatives of people with dementia. Language: German. Contact through Selbsthilfe BE - Beratungszentrum Burgdorf, 0848 33 99 00, info@selbsthilfe-be.ch. Source: Selbsthilfe Schweiz, the national database of self-help groups.