The Institute for Special Systemic Therapy (ISST) - International Center for Rehabilitation was founded by Dr. Klaus and Sabine Berndsen in Unna, Germany in 1984. Since that time, they have accumulated expertise, which allows them to competently advise, diagnose, treat and handle patients fairly. The ISST defines its purpose as a competent provider of therapies to promote and rehabilitate the health of its patients. The ISST concentrates its rehabilitation services in the areas of language, speech, motion, cognition, nerve function, pain, hearing deficits, vertigo and sleep disorders such as snoring and sleep apnea.