Angerstein, Wolfgang Prof. Dr. med. born in Duisburg, 1958 1977-1983 Medical School at Heinrich-Heine-University Duesseldorf 1984-1986 Postgraduate education ENT-clinic of Heinrich-Heine-University Duesseldorf under Prof. Dr. K.-H. Vosteen 1986-1988 Postgraduate education ENT-clinic of St. Johannes-Hospital Dortmund under Prof. Dr. S. Hellmich 1988-1990 Postgraduate education, Department of Phoniatrics & Pedaudiology University Clinic Erlangen under Prof. Dr. G. Kittel 1990-1997 Oberarzt and Deputy Director clinic of Phoniatrics & Pedaudiology University Aachen under Prof. Dr. S. Klajman 1996 Habilitation (Ph.D. thesis: Cervical venous stasis in hyperfunctional dysphonia) since 1997, Dec. 15th, Head of department of Phoniatrics & Pedaudiology, Heinrich-Heine-University Duesseldorf Essential qualifications: Facharzt fuer Phoniatrie und Pädaudiologie, Facharzt fuer Hals-, Nasen-, Ohrenheilkunde; second competences („Zusatzbezeichnungen“) Chirotherapie, Homöopathie, Stimm- und Sprachstörungen; Sachkunde: Laser in der Medizin