AD(H)S Langenthal is a self-help group in Langenthal, Switzerland, for people with ADHD. 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.